A likely first stop for investigators: the department’s body-worn camera policy.It states that all officers “shall activate [body-worn cameras] as soon as practical” when responding to a call for service or while interacting with a member of the public for encounters such as arrests, pursuits and interrogations. Officers’ cameras “shall remain activated” in most instances until police cease contact with an individual or clear a scene. And officers are directed to announce they are terminating a recording prior to doing so, the policy says.Bisagna made no such announcement.