Taxi drivers at San Diego International Airport must pass a checklist of 52 items before being allowed to pick up customers. One criterion on the list is a smell check that officials are responsible for conducting. With 94 percent of the cab drivers being immigrants, there are claims that this test strengthens the stereotype that foreigners smell bad.
See "San Diego Cabbies Cry Foul Over Body Odor Test", Elliot Spagat, ABC News, September 11, 2014