[patmcc]

That's not what anyone means when they talk about cops lying though.

Cops can lie to suspects during questioning. They can say "your friend already confessed" or "we just got a call from the lab, your DNA matches" or "you're getting the death penalty unless you confess right now". As well as bullshit like https://en.wikipedia.org/wiki/Mr._Big_(police_procedure) (in some jurisdictions).

I'm fine with undercover cops lying about whether or not they're wearing a wire, or your scenario. I'm not so keen on uniformed cops lying to elicit confessions.

[op00to]

I agree lying to get a confession is like torture to get information. In most cases, the information you get (and the confession) is bullshit.

[croes]

If you prohibit all lies you also prohibit the good lies