I have heard of many cases where undercover officers used, "I'm a friend of.... (street name)" but anyone who's out there doing business saying "I'm ... (street name)" is pretty stupid anyhow, because what happens if the other party happens to know the real person they're claiming to be? So I am very suspicious whether this is actually happening. How would you ever prove they used your trademark name? Who's going to verify this for you? And truly, as has been mentioned, there are many unoriginal names out there, no trademarks or rights involved. It appears to be one of the general inherent hazards of the business.