Jim Burr's extra whistle

[ref18]

In Canadian football the timing rules are a bit different. THe units were only used in the last 3 minutes of each half where the clock stops on every whistle, the only person who didn't use the precision timing was the referee, because a lot of his whistles are for other things besides stopping the clock. I don't think it was that effective, because i haven't heard of them using it since.