Can they do this? Deduct paying without telling me?

Okay so my boyfriend works at Ford Dealership as a diesel mechanic and well he was getting paid 19 an hour. Well he's in the military (Army) and he was on orders for 2 weeks, his job has all the paperwork and well when he went back to work which was today they told him that he was going to get paid 10 an hour starting today. Is this legal? Is it right? They told him that his evaluation was low and well how could they evaluate him if he was gone for 2 weeks?

Of course. They can change his pay rate at any time (unless he has a written contract).

It would be okay for them to raise his pay on the spur of the moment, right? So why can't they lower it? As long as he is making minimum wage they are perfectly legal.

As long as he is paid above the federal and state minimum wage it is perfectly legal to cut your boyfriend's pay.

100% legal.