I've seen cards that can be put into a PC to do that, or out-board devices
that will connect to a PC, but no warnings from the ads about it being
illegal. I would think it would be necessary to warn people about it being
illegal if the feds had a prohibition about that. If you can interface your
scanner with the PC via a RS 232 cable and have the right software, or can
afford the outboard option or a PC card, I see no reason you could not do
what you would like.