US Patent 9979871 Radio-frequency trigger signal system apparatus and method

A radio-frequency trigger signal system apparatus and method for transmitting a radio-frequency signal coordinated with the pulling of a trigger on a weapon such as a firearm, causing cameras on the weapon, the shooter's person, nearby persons or vehicles, and nearby fixed-position cameras to activate, if needed, to flag photographs and videos taken, and optionally to log and notify an appropriate authority of the pulling of the trigger.