I work for a company in ohio that is part of Dapartment Of Transportation. The company told us when we all first started that they're over time is time and a half at 50 hrs and above. I always thought that it was 40hrs and above. is there some loop hole they found being part of DOT? or are they just cheating us?

There very well could be. However, DOT regs are not my area of expertise, so I suggest you give them a call.