Page:U.S. ex rel. Schutte v. SuperValu.pdf/4

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delivered the opinion of the Court.

The False Claims Act (FCA) imposes liability on anyone who “knowingly” submits a “false” claim to the Government. 31 U. S. C. §3729(a). In some cases, that rule is straightforward: If a law authorized payment of $100 for “each” medical test, and a doctor knows that he did five tests but submits a claim for ten, then he has knowingly submitted a false claim. But sometimes the rule is less clear. If a law authorized payment for only “customary” medical tests, some doctors might be confused when it came time for billing. And, while some doctors might honestly mistake what that term means, others might correctly understand whatever “customary” meant in this context—and submit claims that were inaccurate anyway.