This case arises from a scheme by Gary Bennett to defraud purchasers by rolling *739 back the odometers in the cars he sold to them. The odometers were altered to qualify the cars for Chrysler Corporation’s extended warranty. As part of a plea agreement, Bennett pleaded guilty to two counts of mail fraud. The essence of those counts was that Bennett used the mail to transmit an Application for Title/Registration to two customers which reflected false and fraudulent information regarding the odometer reading of the automobiles sold to those customers. Although only two counts involving two particular vehicles were charged in the information, as part of the plea agreement Bennett agreed that the court could impose restitution with respect to more than eighty vehicles which were purchased from Gary Bennett Dodge, Incorporated. In addition to a period of incarceration, the court ordered restitution in the amount of $137,000.00. That figure was based upon the more than eighty vehicles discussed in the plea agreement. While on probation, Bennett became unable to continue the $500.00-per-month restitution payments, and his probation was revoked.
The Supreme Court subsequently issued its decision in
Hughey v. United States,
The district court denied the motion because it found Hughey inapplicable. First, the court found that the case was distinguishable because the defendant in Hughey was not informed at the time of the plea that he could be ordered to pay restitution for other thefts. In contrast, Bennett agreed to the restitution. The district court then declared that it had not imposed restitution under the VWPA, but rather had imposed it as part of the plea agreement to which Bennett agreed. On appeal, the government does not maintain that the district court could impose restitution through the plea agreement alone without reference to the VWPA. The district court could not exceed the sentencing authority of the VWPA simply because the government and defendant entered into a non-binding plea agreement to that effect. The focus of the arguments on appeal, therefore, concerns the proper interpretation of the Hughey decision.
In
Hughey,
the defendant was charged with three counts of theft by a United States Postal Service employee and three counts of unauthorized use of credit cards. Hughey pleaded guilty to one count of unauthorized use of a credit card, and the remaining charges were dismissed. As part of the factual basis for the plea, the government introduced evidence that Hu-ghey had stolen at least fifteen other credit cards.
*740
The government argues that
Hughey
is distinguishable from the present ease because the offense of conviction in this case required proof of a scheme. Hughey was charged with a number of single-count apparently unrelated incidents. Bennett, on the other hand, was charged with a mail fraud scheme occurring over a two-year period and involving over eighty vehicles. The government argues that when the defendant pleads to a scheme, then the defendant can be required to make restitution for the entire scheme.
See United States v. Marsh,
After
Hughey,
the appropriate focus is on the conduct that forms the basis for the offense. In order to obtain a conviction of mail fraud, the government must prove that the defendant was engaged in a “scheme to defraud.” The scheme alleged in the information and plea in the present case demonstrated a pattern of conduct that resulted in the alteration of odometers on cars sold to customers between July 1982 and October 1984. The information also alleged two specific mailings to two customers that occurred in furtherance of that scheme. The question in this case is whether restitution is limited to the victims of the mailings, or whether any victims of the alleged scheme can be included. Because a scheme to defraud is an element of the offense of mail fraud, a conviction pursuant to that statute allows restitution for all victims of that scheme.
1
A district court addressing a similar fact situation reached this conclusion in
United States v. Marsh,
Bennett relies in part on the Third Circuit’s statement that
Hughey
“rejected the decisions of a number of courts of appeals that had permitted restitution in the full amount of the loss caused by a unified scheme so long as a single conviction arose out of that scheme.”
United States v. Furst,
In a more direct discussion of the issue, the court in United States v. Marsh, 932 *741 F.2d 710, 712-13 (8th Cir.1991), stated that restitution may not be imposed for the entire scheme in a mail fraud conviction but is limited to the specific facts of the individual counts. The two non-authoring judges on the panel, however, did not join in that portion of the court’s opinion. Those two judges instead concurred in the result with respect to that part of the opinion. Therefore, that holding gained the support of only one judge, and is not the holding of the Eighth Circuit. In sum, we have not found any precedent in other circuits which would preclude restitution for the entire scheme in a mail fraud conviction. Moreover, we find the reasoning in the cases discussed above to be unpersuasive. The Supreme Court in Hughey cautioned against an expansive interpretation of the VWPA that would allow restitution for actions beyond the offense of conviction. That does not mean, however, that we should unduly restrict the VWPA to exclude restitution for actions which are elements of the offense of conviction.
Our conclusion that restitution is permissible for victims of the scheme when the scheme is an element of the offense does not end our inquiry.
Hughey
allows restitution only for the
specific
conduct that is the basis of the offense of conviction. The scheme concept is by its nature an amorphous one, and may only support an award of restitution if it is defined with specificity. A contrary rule would allow vague allegations of a scheme to support restitution based upon broad, unsubstantiated conduct. The language of the VWPA, as interpreted in
Hughey,
precludes such speculative awards. In the present case, however, the defendant acknowledged the scope of the scheme in the plea agreement, and agreed to pay restitution with respect to more than eighty vehicles which he purchased. Therefore, the scheme is specifically defined in this case. Under these circumstances, the court appropriately awarded restitution for the losses incurred in the scheme to defraud. Moreover, Bennett is not entitled to retroactive application of
Hughey,
regardless of whether that case would help him or hot. Bennett is here because, without dispute, he violated the terms of his parole by failing to pay restitution. Those parole terms were set when Bennett was sentenced in 1985, and Bennett had his chance to appeal that sentence and those parole terms at that time. Even when the issue is constitutional, defendants generally are not entitled to collaterally attack their convictions or sentences on the basis of a change in the law.
See Teague v. Lane,
This conclusion makes sense. Bennett’s case was a plea bargain. By agreeing to pay the restitution at issue, Bennett received lighter treatment, perhaps in the form of having fewer counts of mail fraud charged against him. Now that the years have passed and adverse witnesses are probably unavailable, Bennett wants out of the deal. He should no more be allowed to turn back the clock than should another defendant who might petition for a
refund
of fines paid in restitution many years ago. “[T]he principle of finality ... is essential to the operation of our criminal justice system.”
Teague,
Notes
. Not all convictions involving fraud would allow such extensive restitution. For instance, in Hughey the government was required to prove an intent to defraud in convicting Hughey of unauthorized use of a credit card. The offense did not, however, require proof of a scheme to defraud, and thus, the evidence of other credit card thefts was not conduct forming the basis of the conviction.
