married filed seperate

I have a friend who she and her husband (for what ever crazy reason) always file their taxes married, seperate. He usually gets a refund normally she is not as lucky. We were chatting over the weekend about the rebate checks and I was telling her if she owes she won't get one. But her question is if her husband didn't owe and with them filling separate, should he still get one??? This is dumb I know, but I told her I had NO idea and would ask you guys:) Thanks Reny