In some states there are laws permitting an employee to inspect his or her file. You usually will not be allowed to copy any of the documents in the file, though in some states you can copy documents that you have signed, such as an employment application or a performance appraisal. If your employer has a file with your medical records you are also permitted to inspect that file.
Most states have laws governing non-compete agreements.
In general, if you're already an employee with an existing work contract for a defined term and your boss requires you to sign such an agreement, it's not enforceable unless your boss compensates you for not taking a job with another company. The employee is protected from discrimination under the Americans With Disabilities Act. And it also means that an employer must reasonably accomodate a worker like Warren who has AIDS or is HIV-positive. Yes, but there are restrictions. Federal laws allow people in certain jobs, such as airline pilots, long-distance drivers, and transit workers, to be tested at random as a condition of their employment.