Never have I had such an experience because I always smoked DMT at home alone. However, I've sometimes had bad trips where I believe that "oh shit the cops raided me just as I smoked DMT", complete with flashing blue/red lights and the thought that I'm being wheeled out to an ambulance because I'm unresponsive. I keep saying to them, "just wait a few minutes and I'll be normal, no need for alarm."