Ding ding. This and a lot of the sensation news pieces that came out a few years before, across the nation, that attracted more people for the wrong reasons that prompted things like challenging the local authorities and resulted in the RAVEact
The opioid epedemic likely contributed as well. Opioids are not exactly conducive to dancing all night.
The MDMA supply in Toronto was turned off overnight when the guy that processed barrels of chemicals at one of the chemistry labs at the University of Waterloo got caught in the spring of 2000.