We have a licence to run BNB business. City of Richmond asked us to register all the guests. I write down all the info of a guest then ask him or her to sign (only in this signing moment a guest could touch the sheet, I don't think other guests info could be in a danger because of this one or two seconds as a guest is signing and would not have time to take a look). I also told you about this. But that day when I was going to write down on the sheet, you took the form from me to write(I felt uncomfortable)and then you were talking about the ID security(now I realized you had misunderstood the procedure). other guests were never like that, they just gave me their IDs, sitting there and waiting until I asked them to sign. they would not have a chance to take a look.
Anyway, thanks for your opinion! I will pay much attention on this in the future.