I live on the KY/TENN line and venture down often. There are couple of towns that still do that even after being told they were not allowed to. Consensus is that the ticket is not enforceable and there is nothing they can do about it. It irks me that the states are giving out the information from the licence plate when they know this is nothing less than a scam. If it were I would frame it and hang it on my wall.
Read the following link about the legality of Tenn's Traffic cameras. Pay close attention to the first line.
How will new Tennessee traffic camera law changes affect roadway safety? | Horton, Ballard & Pemerton PLLC | Chattanooga, Tennessee