We Built a Database of Over 500 iPhones Cops Have Tried to Unlock

""That there are a number of variables involved here does not sound unique to the context of encrypted devices. Law enforcement does not operate in a perfect world," Riana Pfefferkorn, associate director of surveillance and cybersecurity at the Stanford Center for Internet and Society, told Motherboard in an email. "Entropy happens. Witnesses can be difficult to locate and reluctant to speak to investigators. Memories and bruises fade over time; other physical evidence may be damaged or incomplete. Different agencies have different budgets, and when it comes to digital forensics, they don't all have equal access to specialized personnel and equipment.""