What are the vocational rehabilitation rights of injured workers exactly?

Depends...: Workers 'rights' depend upon the policies of their employers i would say.

See details: The answer depends of the laws of your home state. You need to check with the appropriate agency there.

Varies: Your "rights" are determined by a multitude of different factors. The state of residence, the place of injury (job related/not) , the size of business (small businesses are often exempt), and others. You should check with the state employment services offices who often have online sources that describe the law and a process of appeals if you are terminated.