The government appeals from a judgment of the district court dismissing five counts of a sixteen count indictment charging that Nukida tampered with consumer products *667 affecting interstate commerce, in violation of 18 U.S.C. § 1365(a). In granting Nukida’s Federal Rule of Criminal Procedure 12(b) motion to dismiss, the district court concluded that the products allegedly tampered with did not then affect interstate commerce, and therefore it lacked subject matter jurisdiction. The government contends the district court exceeded its authority by ruling on the interstate commerce element prior to trial. Nukida counters that the government has waived this argument by failing to raise it in the trial court. The district court initially exercised jurisdiction pursuant to 18 U.S.C. § 3231. We have jurisdiction over the government’s timely interlocutory appeal pursuant to 18 U.S.C. § 3731. We reverse and remand.
I
Casa Colina Peninsula Rehabilitation Center (Casa Colina) is a medical care facility in Lomita, California. It provides inpatient treatment for patients who require intravenous antibiotic medication, as well as for patients suffering from brain tumors. Conn, Myracks, and Thomas were patients at Casa Colina on February 7 and 8, 1991. All three were being administered intravenous medications which Casa Colina had received from Commerce Advanced Pharmacy Services (pharmacy) in Tujunga, California. The pharmacy had placed substances in plastic bags (I.V. bags) used at Casa Colina, combining drugs it received from various out-of-state suppliers with a dilutant, also manufactured outside California.
Nukida was on duty as a registered nurse at Casa Colina from the evening of February 7 to the morning of February 8,1991. Early in the morning of February 8, Nukida administered intravenous solutions to the three patients. Hours later, around 8:00 a.m., other staff members at Casa Colina observed that Conn and Myracks were flushed, sweating profusely, moaning, and confused. After they both lost consciousness, Conn and My-racks were rushed to a local hospital where doctors discovered that they had dangerously low levels of blood sugar, a life-threatening condition if untreated. Both Conn and My-racks responded to treatment and recovered. Upon learning of the diagnosis, Casa Colina staff members examined other -patients and learned that Thomas also was suffering from low blood sugar.
The staff members collected the five I.V. bags used for the three patients,, immediately halted the administration of intravenous medications throughout the facility, and ordered replacement I.V. bags from a supplier other than the pharmacy. The five bags were tested by the Food and Drug Administration (FDA) at its laboratory in Philadelphia, Pennsylvania. Samples of the medication in the four bags used for Conn and Myracks tested positive for insulin contamination; tests on the bag used for Thomas proved inconclusive.
All of the other I.V. bags at Casa Colina and the tubing used to administer intravenous medications to Conn and Myracks were delivered to the pharmacy where they were inspected by Lum. Lum contacted each out-of-state manufacturer of the drugs to alert them of the situation. Several of the manufacturers conducted internal investigations and testing to determine whether there was evidence of product tampering at their end of the supply chain.
During her investigation, Lum noticed that eleven other I.V. bags were leaking through puncture holes too small to be noticed unless pressure was applied to the bags. The leaking bags, which had been stored in a supply room at Casa Colina, contained medications designated for Conn and Myracks. Lum discovered that an insulin syringe made holes identical to those in the leaking I.V. bags. The FDA examined the eleven bags at its Philadelphia laboratory, and all of them tested positive for insulin. In Washington, D.C., the Federal Bureau of Investigation (FBI) examined the tubing used to administer the intravenous medication to Conn and My-racks; it too had puncture holes.
FBI Special Agent Deppa questioned Nuk-ida three times. After failing a lie detector test during the third interview, Nukida stated that she had intentionally injected insulin into some of the I.V. tubing used for Thomas, Conn, and Myracks. Nukida also stated that she had injected insulin into two bags of *668 intravenous medication in Casa Colina’s storeroom. Subsequently, Nukida was indicted on 16 counts of tampering with consumer products affecting interstate commerce, a violation of 18 U.S.C. § 1365(a).
After being charged, Nukida filed a motion pursuant to Federal Rule of Criminal Procedure 12(b) seeking dismissal of the indictment. Nukida argued that her acts did not affect interstate commerce, the charges in the indictment failed to state an offense, and therefore the district court lacked subject matter jurisdiction over the case. After hearing argument and considering declarations filed by the parties, the district court dismissed counts one through five, which alleged that Nukida had tampered with medications in I.V. bags connected to the patients. The district court held that when the I.V. bags had been connected to the patients’ chest catheters, the medications left the stream , of commerce. Therefore, Nukida’s injection of insulin into the patients’ I.V. tubes which carried the medications did not affect interstate commerce.
The district court left counts 6 through 16 undisturbed. These counts charged Nukida with injecting insulin into I.V. bags stored at Casa Colina. The court held- that the 11 contaminated bags in the storeroom remained in the stream of commerce because they had not yet been attached to patients at the time Nukida allegedly contaminated them with insulin.
The government moved for reconsideration, contending that the district court erred in determining that the medications had left the flow of interstate commerce at the time of contamination. The government also argued that the court had mistakenly disregarded the effects on interstate commerce caused by Nukida’s alleged actions, including the various investigations and testing necessitated by the contamination. After a second hearing, the district court denied the government’s motion, finding that the medication in the five I.V. bags “had reached their ultimate destination and were being consumed at the time the tampering occurred. Therefore, at that time the consumer products were neither in nor affecting interstate commerce.”
The district court rejected the government’s argument regarding the effects on interstate commerce on two grounds. First, the court held that effects which occur later in time than the tampering are not relevant to whether the products in question affect commerce within the meaning of 18 U.S.C. § 1365(a). Even if subsequent effects are relevant, the court reasoned that the effects alleged by the government in this case were insufficiently substantial.
II
The government contends that Nukida’s motion was premature. The government argues that whether the contaminated medications affected interstate commerce constitutes an element of the charged offense which should be decided by the jury. Therefore, resolution of that question must await trial of the general issue, and is not cognizable as a Rule 12(b) motion. The district court, however, treated the entire issue as a question of subject matter jurisdiction. Unfortunately, the district court never received the government’s present argument. The government failed to object, and never apprised the court that it may have been invading the province of the factfinder by entertaining Nukida’s challenge to the interstate commerce element before trial.
In two brief paragraphs of her brief, Nukida contends that it is now too late for the government to argue that the district court improperly decided this question in ruling upon a pretrial motion. Whether the government waived its argument by not raising it until appeal presents an issue to be decided by us in the first instance.
Nukida relies on but one case,
United States v.
Risk,
Even if the question were not within our jurisdiction exception, it clearly falls within the exception which allows consideration of an issue raised initially on appeal if “the issue presented is purely one of law and the opposing party will suffer no prejudice as a result of the failure to raise the issue in the trial court.”
United States v. Carlson,
Ill
We turn now to the merits of the government’s challenge. Whether the district court exceeded its authority in deciding the interstate commerce question before trial. raises a question of law and is therefore reviewed de novo.
United States v. McConney,
A.
Rule 12(b) of the Federal Rules of Criminal Procedure permits consideration of any defense “which is capable of determination without the trial of the general issue.” A motion to dismiss is generally “capable of determination” before trial “if it involves questions of law rather than fact.”
United States v. Shortt Accountancy Corp.,
As the ultimate finder of fact is concerned with the general issue of guilt, a motion requiring factual determinations may be decided before trial if trial of the facts surrounding the commission of the alleged offense would be of no assistance in determining the validity of the defense. Under this standard, the district court must decide the issue ... if it is entirely segrega-ble from the evidence to be presented at trial. If the pretrial claim is substantially founded upon and intertwined with evidence concerning the alleged offense, the motion falls within the province of the ultimate finder of fact and must be deferred.
Id. (internal quotations and citations omitted). .
Generally, Rule 12(b) motions are appropriate to consider “such matters as former jeopardy, former conviction, former acquittal, statute of limitations, immunity, [and] lack of jurisdiction.”
United States v. Smith,
The Eleventh Circuit faced a similar issue in
United States v. Ayarza-Garcia,
The court of appeals rejected this argument, holding that “when a question of federal subject matter jurisdiction is inter-meshed with questions going to the merits, the issue should be determined at trial. This is clearly the case when the jurisdictional requirement is also a substantive element of the offense charged.” Id. After observing that “[s]ection 955a(a) makes the jurisdictional element one of the material elements of the crime of possession of a controlled substance with intent to distribute on the high seas,” id., the court concluded that it would be inappropriate to consider such a question on a Rule 12(b) motion. Instead, “[t]he proper procedure for raising [a] challenge to the sufficiency of the government’s evidence to support a finding of assimilation to statelessness [is] by a motion for judgment of acquittal under Rule 29 and not by a pretrial motion to dismiss.” Id. at 1048^9.
The Eleventh Circuit’s reasoning is persuasive. Reliance on Rule 29 instead of a pretrial motion to dismiss may be less efficient, because Rule 12 serves to help conserve “judicial resources by facilitating the disposition of cases without trial.”
Smith,
Having adopted the reasoning of
Ayarza-Garcia,
the only question is whether affecting interstate commerce, the jurisdictional element in section 1365, is, like the statelessness of a vessel on the high seas, a factual determination “intermeshed with questions going to the merits.”
Ayarza-Garcia,
B.
As the district court recognized, there are two ways to demonstrate the requisite nexus with interstate commerce. First, the government may prove that the medications were “in commerce” when the alleged tampering occurred.
See McLain v. Real Estate Bd.,
Addressing the first theory, the district court ruled as a matter of law that the intravenous solutions had exited the stream of commerce when the I.V. bags containing them were attached via tubing to the patients’ chest catheters. In so ruling, the district court relied exclusively on the legislative history of the statute which, the court concluded, demonstrated that the intravenous solutions were no longer “in commerce” and had lost their interstate character. Although exploring the legislative materials to interpret the interstate commerce requirement of section 1365 is tempting, we conclude that the wiser source is to examine other federal criminal statutes which contain similar provisions. Indeed, the legislative history of section 1365 itself states that the “scope of Federal jurisdiction ... generally parallels that used in other sections of title 18.” H.R.Rep. No. 93, 98th Cong., 1st Sess. 4 (1983), reprinted in 1983 U.S.C.C.A.N. 1257, 1259. By reviewing the court interpretation of these similar statutes, we avail ourselves of judicial wisdom and obviate unfortunate and unnecessary inconsistencies.
In a prosecution under 18 U.S.C. § 922(j), involving stolen firearms, we held that no precise rule exists “for determining when an interstate movement has come to an end. The question is one of fact, to be determined by the jury.”
United States v. Jones,
As for the second theory, that Nukida’s alleged tampering had an economic impact on interstate commerce, the district court made two rulings. First, it found no support in the legislative history for the notion that an economic impact resulting after the tampering suffices to confer federal jurisdiction. The court held as a matter of statutory interpretation that an impact upon interstate commerce occurring after the tampering of a product does not affect commerce within the meaning of section 1365(a). We should look first to the face of the statute itself. Section 1365(a) draws no distinction among effects that occur before, during, or after the tampering; it merely states that the product must affect interstate commerce. The district court erred in relying on legislative history to cloud the meaning of this otherwise clear language.
See Nugget Hy
*672
droelectric, L.P. v. Pacific Gas & Elec. Co.,
The district court’s alternative reason was that any effect on commerce resulting from Nukida’s tampering, including the economic impact of the investigations and testing, was not substantial enough to sustain jurisdiction. It is true that a substantial impact on interstate commerce is required to confer Sherman Act jurisdiction,
McLain,
We need not decide the quantum of impact on interstate commerce required under section 1365, however, because it is clear that, whatever the precise level, the determination of whether Nukida’s actions resulted in sufficient effects on interstate commerce is essentially factual, and therefore inappropriate for resolution on a pretrial motion to dismiss or on this appeal.
See, e.g., Musick v. Burke,
IV
The affecting interstate commerce issue constitutes a material element of the offense prohibited by 18 U.S.C. § 1365(a), and involves a factual determination going to the general issue of Nukida’s guilt or innocence. We therefore hold that the district court exceeded its authority under Rule 12(b) when it considered Nukida’s challenge to the sufficiency of the government’s evidence concerning the contaminated solutions’ relationship to interstate commerce.
See Snyder,
We reverse the district court’s dismissal of counts one through five of the indictment and remand for trial. At trial, the government must prove, beyond a reasonable doubt, that the product was “in commerce” when it was tampered with, or that Nukida’s alleged tampering affected interstate commerce.
REVERSED and REMANDED.
