Abstract: A detection system includes a detector unit capable of detecting whether a current is active in an environment in a vicinity of a worker or other user, whether a voltage is active in the environment in the vicinity of the worker or other user, and/or whether a fall event associated with the worker or other user has occurred. The detector unit includes a status indicator with at least one characteristic of the status indicator changing in response to detection of one or more such events as a method of signaling or warning the worker or other user regarding the detected event. The detector unit may be independently wearable or carryable by the worker or other user and/or may interface with a receiver coupleable to equipment of the worker or other user. The detector units may be in communication with each other and with other devices within a worksite safety system.