What legal case established that officers cannot be compelled to self-witness criminally during an administrative investigation?

The legal case that established that officers cannot be compelled to self-witness criminally during an administrative investigation is Garrity v. New Jersey. This case is significant because it focuses on the protection against self-incrimination as it pertains to law enforcement officers. The Supreme Court held that statements made by police officers in response to questions during an internal investigation could not be used against them in a criminal proceeding if they were compelled under threat of disciplinary action. This ruling reinforces the idea that while officers have a duty to cooperate with internal investigations, they also have the right to protect themselves from being forced to provide evidence that could lead to criminal charges against them. Thus, Garrity provides essential legal protections that maintain the balance between maintaining police integrity and upholding individuals' rights.