Across the country a crucial trove of crime-solving data is sitting unused in the form of untested rape kits. These cardboard boxes contain envelopes filled with hairs, skin cells, semen, clothing and other forensic evidence collected from survivors after they report a sexual assault. If the DNA on these items matches DNA in a criminal database, it can lead to an arrest. It is practically criminal, then, to put women through the emotionally and physically difficult, hours-long collection process and then never analyze the kits. Yet more than 100,000 rape kits in the U.S. are collecting dust on shelves in laboratories, hospitals and police stations because states lack the money—or the will—to process them.