Wouldn't alleged pedophiles who are on the show "To catch a predator" have to give their approval to appear?

On similar reality shows that often capture footage of individuals before they have had a chance to consent, many people have their faces blurred out (Real World, COPS, etc.) On the show "To Catch a Predator", I have never seen a perp's face blurred out. Do they have to consent to this? If so, are they compensated either by NBC (Presumably for cash) or by the Police (Presumably with plea deals)? My roommate and I are baffled. Someone explain!