Legality of Columbo's trick with the cigar box

And the perp says “I got tired of Columbo harassing me, and I saw a cheap way to get a small quantum of revenge by throwing his cigars overboard.”

Or

“I don’t know what he is talking about. I didn’t thrown any box overboard.” (For the youngsters here, these were the days when cameras weren’t everywhere.)

Speaking of confession and Criminal Intent’s Goren, I loved the episode with Jay O. Sanders as the OCD hitman. When Goren tried to intimidate him in the interrogation room, Sanders just sat there staring, didn’t make a reaction, didn’t say a thing. My hero!