The judge will accept any witness that has any knowledge relevant to the case. Depending on the local rules of court in your county and the type of hearing, affidavits (sworn statements) from persons within or outside the state may be acceptable. The basic procedure would just be to call up whoever might have relevant information and see what they know. Expert witnesses need to be disclosed in advance.
Ketan P. Soni
The Rosen Law Firm
4101 Lake Boone Trail, Suite 200
Raleigh, North Carolina 27607
The response posted above is based upon the limited factual information made available and is not intended as a full and complete response to the question. The only reliable manner to obtain complete and adequate legal advice is to consult with an attorney, fully explain your situation, and allow the attorney sufficient opportunity to research the applicable law and facts required to render an accurate opinion. The basic information provided above is intended as a public service but a full discussion with an attorney should be undertaken before taking any action.