If it turns out that the information that a defendant provides during a proffer is inconsistent with the evidence that the government obtains through other sources, then the defendant’s proffer disclosures may be used against him at trial. The government can use the information disclosed during the proffer to refute the defendant’s statements on the stand with the goal of impeaching him through cross-examination. The government can also use proffer information at sentencing, and false statements or material omissions made during the proffer are subject to prosecution under 18 U.S.C. Sect. 1001 (false statements to a federal agent) as a separate federal offense.