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.