This letter, signed by the ACLU, Access Now, and EFF urges changes to the draft “Voluntary Best Practices for UAS Privacy, Transparency, and Accountability.” These “best practices” were negotiated by groups involved in the National Telecommunications and Information Administration’s multistakeholder process concerning privacy, transparency, and accountability issues regarding commercial and private use of drones. The coalition letter raises a number of concerns with the best practices and urges improvements to bring it in line with core principles of protecting privacy while operating drones.