Members of the RCMP march during the Calgary Stampede parade in Calgary, Friday, July 5, 2013. Mounties wearing tiny video cameras must hit the record button when there is &quot;a high likelihood&quot; they'll use force against someone, says an interim RCMP policy on use of the devices.In general, officers have discretion as to when to turn on the body-worn cameras that clip on a uniform, or may be embedded in glasses or a helmet. THE CANADIAN PRESS/Jeff McIntosh