Muslim Taxi Driver Solution

This article in the StarTribune discusses the problem at the Minneapolis St. Paul airport of Muslim taxi drivers refusing fares if it is obvious that the passenger is carrying alcohol. The airport's solution (from the article) is to color code taxi lights to make clear which taxis are willing to take passengers with alcohol.

This is actually a tricky question. We shouldn't force a private businessman to do business he doesn't want to do, but this solution is too accomodating. There is a queue for getting passengers. The taxis have to wait, sometimes for hours, and this queue is managed (I believe) by the airport authority. They should have a simple rule: take or refuse any passenger you wish, but if you refuse, you go to the back of the line.