Applications for leave to appeal two different convictions were dismissed by the Supreme Court of Canada this summer. R. v. So (see R. v. So, 2014 ABCA 451, January 18, 2015 blog entry) dealt with "burping" and the proper operation/functioning of the instrument.  R. v. Hinkley (see R. v. Hinkley, 2013 ABCA 207, October 27, 2013 blog entry) dealt with causation in a fatal collision and also post-driving drinking.