Shift work.

I perform computer help desk support for a large airline catering company in Memphis. I am an exempt employee (No overtime). My regular work hours were Monday -Friday 8:30am to 5pm (7.5 hours). My supervisor recently put me on a shift that one month I work 7am-5pm and the next month 10am to 7pm (8 hours).

I was put into an on-call rotation that makes me carry a beeper every 4th week instead of once every 8 weeks.

I was told that the supervisor could make me work 12 hours a day 7 days a week if he wanted without additional compensation. Is this true?

I know that there were some changes to the overtime laws recently (last few years). How do I get the new regulations so I can see if I qualify as an hourly employee?

Thanks for your help.
John Montgomery