An "All Talkgroup" is a priority talkgroup that is programmed into a fleet of subscriber radios. This talkgroup is used only in imminently dangerous situations (officer in distress, fire mayday, etc.)... No matter what channel an assigned subscriber is affiliated with, when the all talkgroup is transmitted upon by the ECC, the radio monitors that talkgroup for the duration. If the majority or the rest of an agency's talkgroups are encrypted, it's safe to assume the all talkgroup is as well.