A PDD examination offered to an accused against whom other strong evidence exists. The exculpatory examination is often used in the military services when urinalysis has indicated a service member has used an illegal drug. The service member is not obligated to undergo the PDD examination with the military investigative services, but because adverse action can be taken based solely on the urinalysis, many avail themselves of the opportunity. Exculpatory exams are so named because they are intended to offer an opportunity to present evidence to support one’s assertion of innocence.