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What is I have no idea what you're talking about?
The most self-incriminating thing a suspect can say to a law enforcement official.
A suspect who has a substantial amount of evidence linking him/her to a crime will act completely oblivious to the matter.
Saying such a phrase will destroy a suspect's credibility since he/she is being non-cooperative and is obviously lying.
Officer: We've got your DNA on the dead body, your fingerprints are all over the murder weapon, and we have three credible eye-witnesses saying they saw you pull the trigger!
Suspect: I have no idea what you're talking about.
Officer: Thanks, that's all I needed to hear.