TORONTO The amount of fentanyl detected in Toronto’s wastewater supply has tripled during the COVID-19 pandemic as use of other drugs also rose substantially, according to a government survey of sewage in several major Canadian cities. Government scientists analyzed what people in Halifax, Montreal, Toronto, Edmonton and Vancouver were putting down the drains to get a show of how the increase in drug consumption was nationwide, which could be a factor in the surge of deaths related to the toxic opioid drug supply. “If you compare it to Olympic athletes, it’s like a urine test, but at a population level,” said Professor Viviane Yargeau at McGill University.