No, they don't. They find a flea and claim it is the flea he slapped. The DI - Webb - calls the recruit over and asks him if it was a male or female flea. Doesn't matter what the answer is, you know it's not going to be the right flea.
What is also cool about that scene - when he slaps the flea - is that as soon as he slaps it, Webb is right there in his face. Not a nanosecond goes by before the DI is right there.
I only saw it once, a long time ago, but I loved it.
Hard to believe the author left it off his list, but did include Charlie Sheen movies.