The witnesses involved can be as convinced of a false memory as any other.

BBC: Can you trust your memory?

Because when he sees the request of someone who confessed to a crime now claiming innocence, Romney can think back to this issue and realize that the confession might well have been a false memory.

FORBES: Mitt Romney: Time Traveler?

These relate to the encouraging of a false affidavit, the concealment of gifts, the assistance in employment, and the attempt to refresh the memory of his Secretary Betty Currie which done a second time several days later is pure and simple trying to influence her testimony.

CNN: Sen. Allard's closed-door impeachment statement