In most cases, police are not required to tell people that they are being recorded. However, certain states have laws in place requiring the police to inform individuals that the audio or video recording is taking place. For example, some states require officers to provide notification if they intend to record a conversation with an individual or when using a body camera during an encounter. Additionally, some states may require consent from all parties before any recording takes place. Regardless of state law requirements, it's always best practice for police officers to be up front and honest with citizens about their intentions regarding recordings.