I have, in almost every job I have had in the last 26 years. In many of those places, guns were forbidden. It is not difficult to carry a Glock 19 size gun IWB in business casual clothing, with a shirt tucked in. I have carried a Glock 19, 23, 26, 30S, 36 and 43. And it's really easy if you are allowed to wear jeans and untucked shirts. My weapon has never been discovered. However, a receptionist once tried to poke me in my ribs and hit my gun. She didn't give me a 2nd glance, and seemed to have no clue what it was, though.