538
Opinion of the Court
low that because Congress did not tighten the screws on the States, it therefore intended that the screws be entirely removed. The more logical conclusion is that it left the screws in place, untightened.
As a last-ditch argument, Texas contends that its liability for losses in the mail is not a contractual debt for which it owes prejudgment interest, but rather a penalty unilaterally imposed by Congress. See Rodgers v. United States, 332 U. S. 371, 374-376 (1947) (penalties are not normally subject to prejudgment interest). This argument fails because the obligation of Texas to reimburse the Government for a portion of the stamps lost in the mail is quite different from that involved in Rodgers. There the penalties in question were unilaterally imposed by the Agricultural Adjustment Act on farmers who exceeded their production quotas; there was no suggestion that the farmers ever consented to such penalties. Here, on the other hand, Texas signed a Federal/State Agreement, the express terms of which bound the State to act in accordance with the implementing regulations. 7 CFR § 272.2(a)(2) (1986); see also n. 2, supra. Thus, 7 CFR § 274.3(c)(4) (1986), which imposed liability for mail issuance losses above a specified tolerance level, was incorporated into Texas' Federal/State Agreement. The requirement that the States reimburse the Federal Government for a certain portion of mail issuance losses is not a penalty, but a contractual obligation which the State assumed.6
6 Both Texas and the Court of Appeals rely upon our decision in Penn-hurst State School and Hospital v. Halderman, 451 U. S. 1 (1981), for the proposition that the Federal Government may not collect prejudgment interest because neither the Debt Collection Act nor the Food Stamp Act expressly require prejudgment interest. This reliance is misplaced. In Pennhurst, we held that in order to impose conditions on the receipt of federal funds, Congress must speak unambiguously. Id., at 17. This makes sense because the States cannot voluntarily and knowingly agree to a condition that is not clearly expressed. Ibid. Because the duty to pay prejudgment interest on debts owed to the United States existed long before either the Food Stamp Program or the Debt Collection Act was
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