It depends on the kind of work you do.  Generally, an employer may test you for the presence of drugs or for alcohol impairment, but must follow a very detailed set of guidelines and make a written copy of its policies and procedures available to you.  All drug and alcohol testing must be at the employer’s expense and during work time.  In other words, if your boss makes you take a drug or alcohol test, you must be paid for the time the test takes.

An employer or prospective employer may not require you to take a lie detector test as a condition of employment, except in the case of police officers.