I was at a Car Wash with my mom and I had my Wouxun HT with me and I noticed these employees working it were using little bubble pack radios, so I scanned the FRS/GMRS channels and found out, they were using the GMRS channels UNLICENSED! I was shocked! Lol, so decided to mess with them, I scanned the CTCS/DCS tone they were using and scooted down far in the seat, and started talking to them, and their reaction was priceless, I could hear the DTMF I was sending from the car, maaaaan, it was crazy. But don't worry, I gave my callsign on a different PL tone! On a more "professional" level I will usually wait to see if they identify, if they don't after a while of listening I will give my callsign and state they are using a licensed frequency, and if they are licensed they will need to state their GMRS callsign.