The chain of custody refers to the various chain of "hands" that the individual sample passes through. A legal chain of custody requires the samples to be collected in the presence of a third neutral party at a lab, clinic, or hospital facility where all parties have their identity verified. The normal procedure for establishing identification for the mother and alleged father is by the collector or case manager making a copy of the subject’s driver license. The child’s identity is normally verified with a photograph. Most laboratories normally require the participants Social Security numbers. The collector, case manager, or draw site will take each participants DNA sample, fill out the required forms, and be responsible for sealing and mailing the samples to the lab. The collector could possibly be called into court to testify that they properly handled the samples. Most collectors charge additional fees for this expert testimony.