CNN at airports, maybe they're the ones airing triggers. Can't get over the story of Esteban Santiago. Turns himself into the FBI and says the military is making him watch ISIS recruitment videos. FBI lets him go and he ends up doing the Ft. Lauderdale airport shooting. He gets diagnosed as schizophrenic and is still facing the death penalty.
There was a horror movie called 13 Ghosts that was banned for using subliminal messaging. The messages were things like buy popcorn stuff like that. It was re-released later after the messages were made to last a bit longer. They still only showed up for a few seconds. The movie came out in the 1960s, it's not hard to think they could've improved on subliminal messages.