Clearly, it is a concern, and it has come out in a number of documents in terms of what is called cycling or multiple uses. I think one of the directives was that it shouldn't be any more than 15 seconds. Each one is a five-second blast, but you keep pulling the trigger, which is cycling, so it's another five, another five, and another five. That clearly is a problem, and people have looked at it and cautioned against cycling, and they've put a maximum period of time on it.
By the way, on your other comment, the RCMP does 16 hours of training, and the instructors get four days of training. Recertification, I think, is four hours.