Well, today on my trip to the pharmacy, I had my first robber taxi driver. He was very friendly and we had a nice conversation on the way. When I tried to pay him, he told me the automated credit card device wasn't working and he needed my debit card. I gave it to him and he entered the info. He gave me a receipt for $9.70 without the usual info such as his taxi number, date, mileage, etc.
I kept asking him how he was going to enter the $3.00 tip, and he said not to worry about.