It could be as simple as scanning the barcode on a drivers license, the data goes to government system, and they compare what they see. Minus the last step, thi

It could be as simple as scanning the barcode on a drivers license, the data goes to government system, and they compare what they see. Minus the last step, this already happens at lots of places that sell beer. If minimizing privacy invasion, they could type info they're verifying in to get a yes/no instead of seeing whole thing. There's strategies for reducing abuse of such a service, too.