OPINION
The Attorney General of Michigan issued a Notice of Intended Action (“NIA”) to Ammex, Inc. informing it that its advertising might result in the Attorney General filing an enforcement action under the Michigan Consumer Protection Act (“MCPA”). In response, Ammex sought a declaratory judgment against the Attorney General, asserting that the Attorney General could not enforce the MCPA against it because (1) federal law preempted the MCPA with respect to Ammex, and (2) any enforcement of the MCPA against Ammex would abrogate the restrictions placed upon states by the Commerce Clause. The district court eventually dismissed the action as moot based upon the Attorney General’s withdrawal of the NIA. Both Ammex and the Attorney General appeal the district court’s decision. Although the action was not technically mooted by events subsequent to the initiation of the action, we affirm the judgment of the district court because the action was not ripe.
FACTS
Ammex is a Michigan corporation that operates a United States Customs Class 9 bonded warehouse and duty-free store in Detroit, adjacent to the Ambassador Bridge to Canada. The Ammex store is “sterile” in that customers leaving Am-mex’s Ambassador Bridge store may only depart by roads that lead to Canada. In other words, goods sold in the Ammex store may only reach the United States after they have first been exported to Canada because the Ammex store is located beyond the “point-of-no-return” on the United States-Canadian border. At the Ambassador Bridge store, Ammex sells a wide array of duty-free merchandise, as well as gasoline and diesel fuel. At one point, Ammex’s advertising claimed that its goods could be purchased with “no state tax, no federal tax.” Ammex’s sales of gasoline and diesel fuel and its advertising lie at the heart of this action.
Since January 1, 1994, Ammex has paid, under protest, Michigan state sales taxes and motor fuel taxes on its sales of motor fuel.
Ammex, Inc. v. Dep’t of Treasury,
Two months after the state-court ruling, in November 1999, the Michigan Attorney General issued an NIA 1 to Ammex, alleg *701 ing that Ammex falsely advertised that its goods could be purchased at the Ambassador Bridge store free of state and federal taxes. This claim of false advertisement was based on statements that Ammex published on its website to the effect that the “tax-free” nature of goods sold at the Am-mex store resulted in significant savings to Ammex customers. The NIA pointed out that Ammex continued to publish these statements after it had learned from the letter rulings and the Michigan Court of Appeals decision that its sales of gasoline and diesel fuel were subject to both state and federal taxes. Further, the NIA noted that Ammex sold gasoline for prices as high as or higher than its competitors in the Detroit area, implying that, contrary to Ammex’s advertising, Ammex customers were not reaping any savings on gasoline. Through the NIA the Attorney General provided Ammex with the opportunity to cease and desist its allegedly unlawful practices and invited Ammex to confer with the Attorney General. Finally, the NIA warned Ammex that unless Ammex submitted a formal assurance that it would discontinue the allegedly unlawful practice or the Attorney General determined that there was no cause for action, the Attorney General would be authorized to file a lawsuit under the MCPA, which lawsuit might result in an injunction and/or a $25,000 fine.
In February of 2000, in response to the NIA, Ammex filed the declaratory judgment action that is the subject of the present appeal. In its complaint Ammex alleged that the Attorney General was prevented from enforcing the MCPA because (1) federal law relating to duty-free stores preempts the MCPA (Count I); (2) any attempt to enforce the MCPA against Ammex would exceed the restrictions placed on the states by the Commerce Clause with regard to foreign commerce (Count II); and (3) any MCPA action against Ammex based on its Internet advertising would be contrary to the restrictions placed on the states by the Commerce Clause with regard to both foreign and interstate commerce (Count III). 2
Meanwhile, Ammex was also challenging the letter rulings issued by Customs that determined that Ammex could not sell gasoline and diesel fuel on a duty-free basis. In August of 2000, the Court of International Trade ruled that the letter rulings were contrary to law and that Customs acted unlawfully by denying duty-free status to Ammex’s sales of gasoline and diesel fuel based on the reasoning employed in the letter rulings.
See Ammex, Inc. v. United States,
*702 The present action by Ammex against the Attorney General continued with the Attorney General’s answering Ammex’s complaint and filing a motion to dismiss. The motion to dismiss alleged that Am-mex’s complaint contained a number of jurisdictional defects. The district court eventually denied the Attorney General’s motion to dismiss with regard to Counts I, II, and III.
At the close of discovery, the Attorney General filed with the district court a withdrawal of the NIA against Ammex. The withdrawal stated that the Attorney General would not reinstate the NIA, nor issue a new NIA with regard to Ammex’s advertising, unless the following “changed circumstances” occurred:
1. A final judgment is entered in a tax case for tax periods including, or following, the issuance of the [Ammex 7]deci-sion in which it is determined that:
(a) State sales tax applies in connection with retail sales of items other than motor fuel by Ammex; OR
(b) State sales tax and/or state motor fuel taxes apply in connection with retail sales of motor fuel by Ammex.
OR
2. It is conclusively determined, whether by final administrative order (including appeal), judicial order (including appeal), or by federal legislation or treaty, or in any other conclusive manner, that Ammex may not sell motor fuel free of duty, notwithstanding the [Ammex /] decision [sic].
J.A. at 330-31. Based on the withdrawal, the Attorney General then filed a motion that asserted, inter alia, that the action was moot. A magistrate judge recommended that the court deny the motion to dismiss, but the Attorney General did not file objections to the recommendation.
After the magistrate judge issued his recommendation, Ammex and the Attorney General filed cross-motions for summary judgment, each addressing Counts I, II, and III of Ammex’s complaint. At the hearing regarding the motions for summary judgment, the district court raised the mootness issue sua sponte. The district court determined that the Attorney General’s withdrawal of the NIA mooted the action, and ordered the case dismissed. Both the Attorney General and Ammex have appealed the district court’s decision to this court.
I. Ammex’s Complaint Established the Existence of Subject Matter Jurisdiction.
Before we reach the issue of mootness, the Attorney General claims that this court does not have subject matter jurisdiction over Ammex’s preemption claim. Although the Attorney General did not raise this question below, “the existence of federal jurisdiction may be questioned at any point in the course of litigation and ... parties cannot waive the requirement of subject matter jurisdiction.”
Riggs v. Island Creek Coal Co., 542
F.2d 339, 343 (6th Cir.1976). Contrary to the Attorney General’s position, the district court did have federal subject matter jurisdiction over Ammex’s claims. We review the existence of subject matter jurisdiction
de novo. Ullmo v. Gilmour Acad.,
The Supreme Court’s decision in
Shaw v. Delta Air Lines, Inc.
makes clear that a federal court has subject matter
*703
jurisdiction when a person seeks to enjoin state officials from enforcing a state regulation against the person on the ground that the regulation violates federal rights.
See Shaw v. Delta Air Lines, Inc.,
The Attorney General asks this court, however, to consider the Second Circuit’s opinion in
Fleet Bank, National Association v. Burke,
In concluding that the district court did not have subject matter jurisdiction over the action, the Second Circuit noted that, unlike the case before it, none of the Shaiv plaintiffs, or the plaintiffs in the cases upon which Shaw relied, raised issues that required the interpretation of state law. Id. at 889. The court found that this distinction mattered, reasoning that the interpretation of state law would implicate complicated abstention doctrines and Eleventh Amendment concerns, while also risking “a major and unwarranted incursion on the authority of state courts to construe state statutes.” Id. at 891-92. Consequently, the Fleet Bank court refused to extend Shaw “beyond instances where the plaintiff, seeking an injunction on the ground of preemption, does not dispute the meaning and application of state law.” Id. *704 at 893. The Attorney General asserts that this case falls within the holding of the Fleet Bank decision.
Fleet Bank, however, is distinguishable from this case. Here Ammex did not seek a declaratory judgment that its advertising does not violate the MCPA, nor did it ask the district court to interpret Michigan law. Rather Ammex’s complaint only asked the court to determine if the MCPA violated its federal rights and, if so, to enjoin the Attorney General from enforcing the MCPA against Ammex. In short, in Ammex’s federal pleading, it did not dispute the meaning or application of state law. The Attorney General, however, urges us to consider what Ammex would have pleaded had it waited for the commencement of a state enforcement action. The Attorney General contends that it is unimaginable in such circumstances that Ammex would have pleaded only a preemption defense.
Accepting such an argument would expand
Fleet Bank
to such an extent that it would render meaningless the Supreme Court’s repeated holdings that federal jurisdiction extends to suits to enjoin state enforcement on federal preemption and comparable grounds.
See Verizon Md., Inc.,
II. The Attorney General’s Withdrawal of the NIA Did Not Moot Ammex’s Claim.
The district court dismissed this action on the ground that it was mooted by the Attorney General’s withdrawal of the NIA. While the district court properly dismissed on justiciability grounds, as we explain in part III, it was not proper for the district court to rely on the mootness doctrine, inasmuch as the Attorney General’s withdrawal did not make it absolutely clear that the allegedly wrongful conduct could not be reasonably expected to recur. We review
de novo
a district court’s decision that an action has been mooted.
NAACP v. City of Parma,
“Under Article III of the Constitution, [a federal court’s] jurisdiction extends only to actual cases and controversies. [A federal court has] no power to adjudicate disputes which are moot.”
McPherson v. Mich. High Sch. Athletic Ass’n, Inc.,
Against this legal backdrop, the district court, principally relying on
Picrin-Peron v. Rison,
We are reluctant to rely upon Picrin-Peron here because it is different in some important respects. The instant case is of course not a habeas corpus case, and Am-mex arguably does not enjoy all of the relief that the court could enter. Moreover, the Attorney General’s withdrawal of the NIA here is different from the sworn statement in Picrin-Peron in a significant way. In Picrin-Peron there was no indication that the INS knew at the time of its statement that any of the “changed circumstances” were reasonably likely to occur. Here, the Attorney General’s withdrawal acknowledges that related litigation is ongoing and might reasonably be expected to lead to the “changed circumstances” articulated in the withdrawal. See J.A. at 330 (stating that the Attorney General would “forbear from issuing similar notices of intended action or filing suit on the basis of the matters raised in the [NIA] under the [MCPA] until the effect of [Ammex I’s] ruling on tax matters has been conclusively resolved ” (emphasis supplied)). The Attorney General’s withdrawal thus does not make it absolutely clear that the enforcement action is not reasonably likely to recur. Consequently, *706 the mootness doctrine, without more, does not provide a sufficient basis for dismissing this case.
III. Ammex’s Claims Are Not Ripe.
Although Ammex’s claims were not technically mooted by the Attorney General’s withdrawal of the NIA, Ammex’s claims are not ripe. Accordingly, we affirm the district court’s judgment on ripeness grounds. We review issues of justiciablity, such as ripeness,
de novo. NRA of Am. v. Magaw,
The ripeness inquiry arises most clearly when litigants seek to enjoin the enforcement of statutes, regulations, or policies that have not yet been enforced against them. Recent holdings of the Supreme Court make clear the continuing validity in that context of the three-part test for ripeness in the companion cases of
Abbott Laboratories v. Gardner,
The ripeness doctrine “is drawn both from Article III limitations on judicial power and from prudential reasons for refusing to exercise jurisdiction.”
Reno v. Catholic Soc. Servs., Inc.,
to prevent the courts, through avoidance of premature adjudication, from entangling themselves in abstract disagreements over administrative policies, and also to protect the agencies from judicial interference until an administrative decision has been formalized and its effects felt in a concrete way by the challenging parties.
Abbott Labs.,
A. Judicial fitness: the benefit to the court of a concrete factual context.
Ammex’s legal contention is that the MCPA does not apply to its activities because it is preempted by federal statutes and by the negative implications of the Commerce Clause. Analysis of both issues would be significantly benefitted by the concrete context that would be afforded by *707 an enforcement action against a specific action by Ammex.
The issue in
Abbott Laboratories
was whether a particular regulation (requiring the generic name of a drug to accompany the brand name every time on drug label-ling) was consistent with the Federal Drug and Cosmetic Act.
Similarly, in
Ohio Forestry Ass’n,
the Supreme Court, unanimously reversing this court, held that a challenge to a U.S. Forest Service management plan was not ripe.
[Rjeview of the Sierra Club’s claims regarding logging and clearcutting now would require time-consuming judicial consideration of the details of an elaborate, technically based plan, which predicts consequences that may affect many different parcels of land in a variety of ways, and which effects themselves may change over time. That review would have to take place without benefit of the focus that a particular logging proposal could provide. Thus, for example, the court below in evaluating the Sierra Club’s claims had to focus upon whether the Plan as a whole was “improperly skewed,” rather than focus upon whether the decision to allow clearcutting on a particular site was improper, say, because the site was better suited to another use or logging there would cumulatively result in too many trees’ being cut.
With regard to the need for more factual development, this case is more like
Toilet Goods
and
Ohio Forestry Ass’n
than like
Abbott Laboratories.
The court’s need for more factual development consideration thus weighs against ripeness in this case. Ammex is not challenging a specific rule or finding of the Michigan Attorney General, but rather the general applicability of a statutory scheme to its conduct. Analysis of any preemption or Commerce Clause issue would benefit from knowledge of just what was forbidden by the MCPA, and what the effects of the state’s regulation
*708
would be on the policies underlying the Interstate and Foreign Commerce Clauses and the federal statutes relied upon by Ammex. Unlike the claims that this court found to be ripe in
NRA of America v. Magaw,
this is not a situation where “[n]o factual development can change what the statute bans and what it protects.”
B. Judicial Fitness: Permitting an Agency to Refine Its Policies
The second aspect of the judicial fitness inquiry is perhaps the strongest against ripeness in this case. Courts should avoid pre-enforcement challenges that do not permit enforcement agencies to refine their policies. In
Abbott Laboratories
the case was ripe where the challenge was to a final regulation that the FDA was unlikely to change. There was “no hint” that the regulation was tentative.
[t]he regulation serves notice only that the Commissioner may under certain circumstances order inspection of certain facilities and data, and that further certification of additives may be refused to those who decline to permit a duly authorized inspection until they have complied in that regard. At this juncture we have no idea whether or when such an inspection will be ordered and what reasons the Commissioner will give to justify his order.
Similarly, in finding that the challenge to the forestry management plan in
Ohio Forestry Ass’n
was not ripe, the Court relied upon several post-plan administrative actions to conclude that “the possibility that further consideration will actually occur before the Plan is implemented is not theoretical, but real.”
The possibility that the agency will modify its position is far stronger here than it was in
Toilet Goods
or
Ohio Forestry Ass’n.
There is not even the “final agency action” that there was in
Toilet Goods.
The NIA was at most an initiation of proceedings, and a permissively worded one at that, allowing that “unless an Assurance of Discontinuance is accepted, or
it is determined that there is no cause for action,
the Attorney General will be authorized to file a lawsuit against AMMEX, INC.” J.A. at 15 (emphasis supplied).
Cf. FTC v. Standard Oil of Cal.,
C. The Hardship to Ammex in Waiting for Enforcement.
Finally, whatever hardship Ammex incurs by waiting for enforcement is not enough to outweigh the above-considered factors weighing against ripeness here. In
Abbott Laboratories,
the claim was ripe in part because the challenged regulation had a direct and immediate impact on the day-to-day operations of the plaintiff drug company. The drug companies either had to incur the enormous cost of changing all their labels and promotional materials, or “risk serious criminal and civil penalties for the unlawful distribution of ‘misbrand-ed’ drugs.”
Abbott Labs.,
The Supreme Court recently focused on the hardship factor in finding that a challenge to a National Park Service regulation was not ripe.
Nat’l Park Hospitality Ass’n,
538 U.S. at ---,
The hardship to Ammex in this case appears to fall between the situations in
Abbott Laboratories
and
Toilet Goods.
Unlike in
Abbott Laboratories,
there are no allegations of huge immediate expense in temporarily complying with the requirements of the MCPA. There is also no asserted threat of criminal liability. And while the possibility of $25,000 in fines is
*710
referred to in the (now-withdrawn) NIA, it is not clear that such fines would be imposed for actions prior to a valid NIA. In
Abbott Laboratories,
in contrast, the agency affirmatively took the position that immediate compliance was required.
On the other hand, if Ammex is ultimately not permitted to sell gas on a tax-free basis, it may then be on the horns of a dilemma as to the extent to which it may advertise that it is a “tax-free” facility without subjecting itself to significant fines. In that event, Ammex may undergo some uncertainty as to just how far it can go in publicizing its tax-free status without risking penalties under a Michigan statute that Ammex claims is not applicable to it. And while the Attorney General has not asserted that he will seek the imposition of fines for activity preceding the issuance of an NIA, neither has the Attorney General’s counsel assured us that the Attorney General will not.
While this factor presents a closer question than the other two relevant factors, a weighing of the three factors together leads to the conclusion that this case is not ripe. At this stage the Attorney General has indicated in a very tentative way, in a notice that has been withdrawn, that a general consumer protection statute applies to Ammex, but indicated that under certain conditions the Attorney General will not seek to enforce the statute. The uncertainty that Ammex may (perhaps) face is not significantly different from that faced by any regulated party claiming that it is immune from an entire scheme of regulation.
CONCLUSION
Because Ammex’s pre-enforcement challenge to the applicability of the MCPA is not ripe, we AFFIRM the judgment of the district court.
Notes
. At least ten days prior to the commencement of an action under the MCPA, the Attorney General must “notify the person of [the] intended action and give the person an opportunity to cease and desist from the alleged unlawful method, act, or practice or to confer with the attorney general in person, by counsel, or by other representative as to the proposed action before the proposed filing date,” absent a court waiver upon a showing of good cause. Mich. Comp. Laws § 445.905(2).
. The complaint also included a fourth count that asked the district court to enjoin aspects of Michigan's sales tax act. The district court dismissed the fourth count and Ammex has not appealed that decision.
. Ammex sought to bar the revocation by invoking res judicata against Customs. See
Ammex II,
. Whether federal subject matter jurisdiction exists when the plaintiff seeks merely declaratory relief from state regulation on enforcement grounds, however, is not as clear.
See Fleet Bank, Nat'l Ass’n v. Burke,
