they dont have to tell you shit...i was going to go into law enforcement myself, i took classes i talked to cops, i took classes with ex undercover narcotics agents...they dont have to tell you shit....they can say no and youre still fucked...some of you ppl got your facts waaaaaaaay wrong...but its up to you wether you want to be a sucker or not...
long story short...no...they can lie all they want...and no its not entrapment...entrapment is a totally different thing than lying when you ask the if they are cops.