They’re scanning it, not taking it back to their car.I understand that you can access wallet without unlocking your phone, but often times just looking at the phone automatically unlocks. Also, don't forget that at least in the US, we hand our ID to police to take back to vehicle. Do you really want to give your phone to the police for an unknown amount of time? I am actually pro-policing, but I think a cell-phone camera is a big form of protection for us common folk.