CNN can usually be turned off in hospital or doctor’s waiting rooms or where ever it is on. I have done it often myself when our daughter used to be hospitalized often (she is fully recovered now). Also hotel lobbies, etc.
Just find the off button on the side or back of the TV. I have never received a complaint for doing this.
Also, I think that Time Warner (Spectrum) is CNN’s parent company - not sure how we can turn them off - thoughts?
All I ever see playing in doctors' offices is some sort of medical news garbage. Never CNN. That is one less thing to have to worry about!