Sven thanks for the follow up on the story.

But I wonder what can be done to prevent somebody from going missing on a job site due to an injury.

In our building security checks on all the electricial and mechanical rooms as part of their rounds. They have to swipe a barcode at the far end of the area to prove that they did check the room.

Any temporary trades get an key card id badge and if not turned in at the end of the day somebody goes looking to see if they are still in their assigned area.

In new construction such as the new arena they are building in Winnipeg I am not sure what could be done to track everybodys work location short of a small GPS on your tool belt.