Law enforcement routinely secures orders requiring that tech companies hand over data, but the targets of those requests don't always know if they've been under the microscope -- especially if there were never charges in the first place. MIT's CSAIL may have a way to hold officers more accountable for those decisions. Its researchers are developing a cryptography-based system that could help track these requests while still protecting investigations and police. AUDIT (Accountability of Unreleased Data for Improved Transparency) would require that law enforcers submit requests to a public ledger sometime after the fact using a "cryptographic commitment." The approach would ensure that police and courts send all the right documents in a way the public can see, but would keep the agencies' actions confidential.