It does come down to trust, and if you walk into my doctor’s visit with a camera strapped to your face, you’ve lost mine. Doesn’t matter if it’s on or not. I distrust your descion-making abilities on a fundamental level. Plus, if they’re the kind of person who would try and film someone without them knowing, they’re also the kind of person to lie about it being off. But honestly, they might not even be trying to record surreptitiously, they might do it on accident. I’ve got a buddy who worked in IT customer support for a medical device company and would tell us horror stories, the amount of American doctors who have absolutely no fucking clue how basic technology works is staggering. Like truly scary, considering how highly we regard them and their presumed intelligence.