Glad to see someone else from Waterloo in the comments! I'm not sure that what local police department serves your area, but the Waterloo Regional Police Service are actually really ahead of the curve when it comes to drug impaired driving. They have more drug recognition experts per capital than almost any other jurisdiction in Canada and if I am remembering correctly they are making it mandatory to train new recruits in the standard field sobriety tests.

They should still be listening to your complaints, however. Hope you have better luck in the future.