We had wine friends in Cincy who had a very nice dog they brought to the wine tastings. He was fine and welcome there. No problem. Then they admitted they wanted to take him on trips, flying, so they got some certificate on line to make him a "service dog". There was nothing involved, a piece of paper and they bought a vest for him.
I sat another time eating lunch watching this woman with her "service dog in training" sitting while she fed him food off her plate. The dog was not really a problem, he was focused on the food. But, there is no way that is how you train any SD by feeding him off your plate.
My wife gets pretty upset when she sees them inside in grocery stores and around food. I've had to leave a couple times because of the situation.