You're right, Rik, he's seen the list and it only shows one WGA signatory agency in Michigan and they won't return his calls.
He's a 20 year veteran police detective and has written a number of scripts. He is interested in getting them to television cop shows like Law & Order and CSI. I think his dream is to create a new television show based on his first script (The Tank, a short film I made for him with no budget). He has written several other shorts centered on the tank and many other police procedural-type scripts.
I told him to gather his best material in a portfolio and physically go to the one agent in Michigan, but I'm not sure that would get him any further than his un-returned phone call. Any advice or personal recommendation you could give I would pass on most appreciatively.