Damaged evidence is something that is common among rape kits because survivors of sexual assault typically desire to wash themselves as soon as possible following an attack. Prior to the exam, it is desired that patients avoid using the rest room, combing their hair, bathing, changing their clothes or cleaning up the scene of the assault. Most evidence needs to be collected within 72 hours to be viable, and patients are advised to either bring or wear the clothing they had on when attacked to the exam.