The Financial Post reports in its Wednesday, Sept. 4, edition that when it comes to cannabis, the proof is in the peeing. A Bloomberg dispatch to the Post reports that Statistics Canada has been collecting and testing municipal wastewater samples from five cities for traces of cannabis to gauge actual usage of the now legal drug. Bloomberg says the results are surprising, and some cases contradictory. When cannabis is consumed, the body converts THC into THC-COOH, which can then be measured in wastewater. Of the five cities measured between March, 2018, and February, 2019, Halifax had the highest average "load" of THC-COOH per capita, followed by Montreal, Toronto, Vancouver and Edmonton. What is surprising is that Montreal's levels are so high, when only 10 per cent of Quebeckers reported cannabis use in the second quarter, the lowest of any province. Edmonton's low wastewater results are also confounding, as Alberta had the third-highest reported pot use at 20 per cent. Statscan says it is difficult to get people to accurately divulge their pot use, which explains, in part, the contradictory findings. In analyzing the Montreal.