Cops will lie to you over the most trivial of shit to try to get you to confess.

Years ago when I was a kid I was accused of .. harassing phone calls or something, I don't even remember all the details, but the cop lied to my face saying my other friend had admitted we did it and I should confess now to make it easier on me. I basically laughed at him and told him he was full of shit. And I was right, eventually he left and nothing ever came of it.