Federal prosecutors in San Francisco filed a criminal complaint against Abdulrahman Alfozan, a 35-year-old Saudi national and OpenAI engineer, who was arrested on Friday. The complaint does not name the company, but OpenAI confirmed in a separate statement that it found a sophisticated recording device hidden in one of its offices. Officials say the aim was to capture sensitive conversations about the company's technology. The arrest came a week after the device was discovered. OpenAI said it used its models to understand the device and where it came from, and concluded a specific employee had planted it a few days earlier. It fired the employee and referred the matter to the FBI, which says its investigation is ongoing. Neither the complaint nor OpenAI's statement, as reported, says who the recordings were meant for. The case lands as labs debate how much outsiders may see inside them. For anyone building at a frontier-adjacent company, it is a reminder that insider and physical security matter alongside model security, and that hardware sweeps, access logs and offboarding are part of protecting unreleased work.