If I was being arrested for impersonating a police officer, I would make sure that it happened in a crowded public area. I'd make a big scene and say things like, "I'M THE REAL COP!" and, "HE'S AN IMPOSTER!", or, "YOU HAVE TO STOP HIM! THEY HAVE MY DAUGHTER!".
I mean... who would you believe?
"YOU DON'T KNOW HOW FAR UP THIS GOES!"