> Being totally open and honest with suspects gives them control over the situation, at least to the guilty suspects who by definition know more than the police ever can.

This fails to account for innocent suspects, who are already having a bad day and are all too often convicted despite their innocence. The police not knowing means that they should be careful, not reckless. You cannot presume guilt in order to justify lying or psychological torture.

> Ever wonder why cops ask you how fast you were going before they pulled you over? Its because they are unsure and want you to admit your mistake. It is trickery but not evil.

It’s also not lying.

Sure, but just asking you is different than lying to you, such as claiming the radar gun clocked you at 98, subject to something like reckless driving, when it was actually only 82, a speeding ticket.