[TigersEye]

A person can’t be proven later on by investigators to have lied if they insert a convenient lapse of memory at the appropriate time during an interview.

Tell that to Scooter Libby.

[MGG]

and then one night. Fredo slipped and said Johnny Yola told him about the Superman Show.....

[eyeamok]

you Beat me to it

Mr. Fitzgerald nonetheless pressed on for someone to prosecute, eventually focusing on Mr. Libby, whose trial became a contest of recollections.

http://www.wsj.com/articles/peter-berkowitz-the-false-evidence-against-scooter-libby-1428365713