A similar question I have:
I sell a handgun FTF in Ohio. To my understanding I have no legal obligation to ascertain the state residency or age of the person purchasing the firearm. I have no responsibility to check their drivers license. I always do, but I am not sure I am legally required to check their License or even ask them. I would assume if I neglect to ask them and they do not qualify I am ok, if I for some reason know they are not qualified and sell I am positive I would be committing conspiracy to...
Not really sure, and never looked into it as I just check the DL anyways, but my take on the issue.