Before you jump to any conclusions about what Sen. Larry Craig (R-Carplips) was doing in that restroom, consider his history as a crusading Senator who likes to spank "nasty, bad, naughty boys."
Larry Craig on Meet the Press, Jan, 24, 1994:
SEN. CRAIG: Well, I don't know where the Senate's going to be on that issue of an up or down vote on impeachment, but I will tell you that the Senate certainly can bring about a censure reslution and it's a slap on the wrist. It's a, "Bad boy, Bill Clinton. You're a naughty boy." The American people already know that Bill Clinton is a bad boy, a naughty boy.
I'm going to speak out for the citizens of my state, who in the majority think that Bill Clinton is probably even a nasty, bad, naughty boy.
Read the full quote, here.
He probably thought the policeman was doing something naughty and needed a spanking.