Side-tracking the thread a little.

Do any of you know if vendors at the gun shows still accept Colorado Drivers Licenses with the current address written or labelled on the back of the ID as proof of address when purchasing a firearm? Colorado DMV often advises people to print out a label with their new address when they move vs issuing a new ID. Last time I attended a show vendors would not only accept them, but would sometimes hand them a permanent marker or bLank label so the could make a change. I may be wrong, but I believe ATF’s position is that someone just writing an address on their ID is not valid proof of residence.

Do they still accept them and is it legal per ATF?