Man it's all good. My mom used to work at the police dept. and junior cops were middle school kids that got fake badges and took classes on "dope fiends". So this dumb motherfucker just thought up the first official sounding term. Are you sure he wasn't buying a rock with that $30? Sounds like a fuckin' crackhead to me.
But seriously stings don't work if the person in question is alerted. An easy way to check for a phone tap is to call the phone from a payphone. If you hear a high pitched whistle, a tap is in use. That trick works with most public pay phones ( it was a defect in the design). SO...chill.