11.   If he lied, or if he urged others to lie or conceal evidence, he could face the threat of impeachment.

12.   In many of those cases, however, the police and prosecutors were later found to have mishandled or concealed evidence that might have helped a defendant.

13.   In the grand jury, Clinton denied trying to influence Lewinsky, Currie and White House aides to lie or conceal evidence.

14.   Investigators are examining whether Clinton or his aides took steps to conceal evidence in the Jones suit.

15.   Key has accused government agents of bungling efforts to foil the bombing and of concealing evidence that officials lost a chance to stop the attack.

16.   Kelly, you will recall, helped her conceal some evidence.

17.   One is a collection of audio tape excerpts never before broadcast that implicate Nixon and his staff plotting through the CIA to conceal Watergate evidence from the FBI.

18.   Some exculpatory evidence was deliberately concealed.

19.   Starr has focused on Mrs. Clinton in part because of questions of whether she concealed evidence such as billing records from her days at the Rose Law Firm.

20.   The company admitted that it had concealed evidence of its poor performance in reviewing and paying claims of Medicare beneficiaries in Illinois and Michigan.