I would ike to try an escort for the first time, but Idon't want to get arrested by an undercover cop.  How can I make sure an escort is really an escort?

There is a "Newbie Board" on TER.  Look to the left and you'll see FAQ for Newbies.  Do a search on that board for "cops", "LE" etc. That board is devoted to these types of questions. Good luck friend, and happy hobbying!