Yeah they call it "extended hours". Anything up to 40 isn't technically OT since we still get paid at our regular rate, anything beyond 40 you get time and a half. Supposedly when they need people to cover shifts they look for people who need to make up extended hours first but I've had plenty of times where I wasn't able to get to 40 in a week and saw full time people getting OT so I'm not sure if that's true.
They try to keep the OT down but it's a residential facility so somebody always has to be here for the clients. Back in the summer I was averaging 45-50 hours a week, while still only being scheduled for 35. One time I had 35 hours of OT on one check.