Justice Thomas, delivered the opinion of the Court.
The qui tam provision of the False Claims Act (FCA or Act), 31 U. S. C. § 3730(b), permits, in certain circumstances, suits by private parties on behalf of the United States against anyone submitting a false claim to the Government. Prior to 1986, such suits were barred if the information on which they were based was already in the Government's possession. At issue in this case is whether a 1986 amendment...
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