Hi Richie,
Without a lot more detail, answering your question effectively is going to be very difficult.
You say 'salaried'. Does this imply an 'exempt' employee?
FLSA (Fair Labor Standards Act) defines two classes of employee/workers. These definitions 'non-exempt' and 'exempt' refer directly to the Act, not necessarily to the actual job. 'Salaried' does not necessarily mean exempt, although most employers treat it that way.
http://www.dol.gov/whd/flsa/i
ndex.htm gives you some good info on the Act and what it covers.
You say 'compensation'. Is the employee paid a salary or not?
What does the employment agreement and company handbook say about work hours, schedules, etc.? Are these kinds of issues addressed?
If you feel the employee in question is 'owed' additional compensation, ie Overtime or other pay, you should bring all of the detail and supporting documents to a good local attorney who deals with labor issues in your area.
Hope this helps.
Source: http://www.abusinessmentor.com