Maltreatment does exist (I appreciate you haven't said it doesn't) .. on one occasion when I was brought into A&E, the doctor designated to me took blood from me by rotating the needle inside my arm until my entire left hand was covered in blood and was actually looking me directly in the eyes as if studying my reaction when he was doing it until I shouted out in pain. I got no apology from him, he told a nurse to clean me up as he was walking out of the room and she tossed some wipes onto my table and told me to clean myself up. I hadn't been brought to the hospital for anything anti social like violence so I still can't understand what his problem was but it was definitely deliberate .. I wasn't drunk or on drugs or anything, it was really weird. I told a nurse about it on the ward I was later taken to because I was considering reporting him, the nurse said all that would probably happen would be that a poster asking staff to be more careful would be put up. I didn't have a pen on me at the time to write down his name, I wasn't in a very good state at the time anyway to be worrying about asking for a pen, I tried to take a photo of my hand with my phone but my lens was too scratched up on my old phone to get a picture. I wish now I hadn't cleaned my own hand so that the staff on the ward I was taken to would have asked questions. I think the doctor in question was just burned out instead of bogus, I saw him walking about a few times over the next few days although he was a sadist, no doubt in my mind. He even smirked when he saw he was causing me pain.
edit: bogus hospital staff are also not unheard of, one bloke masquerading as a doctor was caught at the hospital I used to work at after a MOX (early internal email system used by the NHS around 2001 times) was sent out to all staff and he was challenged. The director Neil Labuke made a film about the phenomena titled 'Nurse Betty' about a woman wrapped up in a fantasy world revolving a hospital soap opera she was a fan of where the woman starts working as a fake nurse at a real hospital. This film isn't a comedy film, the studio released this seemingly 'wacky' comedy trailer to sell more tickets.