Statements that Ms. Lewinsky makes to other people are not viewed as independent corroborative evidence.

CNN

Nor, as a rule, is there any corroborative evidence, since abuse tends to take place in private.

ECONOMIST: Sex-abuse cases

The corroborative evidence that the prosecutor would have to have there, which is required in a perjury case.

CNN

And while we haven't yet found, and may not find, stockpiles of chemical or biological weapons in Iraq, David Kay reports that the Iraq survey group has obtained corroborative evidence of Saddam's nuclear, chemical and biological programs, covert laboratories, advanced missile programs, and Iraq's program active right up to the start of the war to conceal WMD-related developments from the U.N. inspectors.

CENTERFORSECURITYPOLICY: Remarks to the Council on Foreign Relations