So I saw this on TA and sounded like a good idea -- sorry if it has been posted before. It was a suggestion from an airline ticket agent "If you are going to be in a cab....take a picture of the cab company on the side of the cab, take a picture of their operators permit, and take a picture of the license plate. This is in case you leave something in the cab.....there are hundreds of cabs here and at least 5 cab companies. In case you leave something in the cab and need to find it right away." I thought it was a pretty good idea -- plus if you start off by snapping a photo it might discourage getting tunneled. I don't know if I would take a picture of the operator's permit but taking a photo of the cab with the Cab # sounds like a good idea.