If we don't have a volunteer in the region of the applicant, you should contact a local rescue organization and ask them if they can send someone that is experienced in dog placement to meet the applicant for you and do a home visit. Make sure the local shelter sends someone who understands the breed and have the knowledge to determine if this is a good home for a Pit Bull. You should correspond several times with the applicant. Don't be afraid to ask as many questions as you want. Make it a priority to contact the applicant's references and ask them a lot of questions.
Veterinarians are good references, and are usually very cooperative.
Remember that this breed is the target of breed-specific legislation in many municipalities and states across the nation, and already has several breed specific restrictions against it. Please do not contribute to the problem by placing a bad dog in the wrong hands. These dogs can be great pets and wonderful companions when placed with the right people. They are worth working hard to find caring and responsible owners for them.