The article references the landmark Jane Doe decision against the Toronto police in the 1990s.  Here's an excerpt from the Court's summary of that decision:

"The police force failed utterly in their duty to protect the plaintiff and the other victims from a serial rapist known to be in their midst by failing to warn them so that they might have had the opportunity to take steps to protect themselves....

"The police investigation was carried out in a way that denied the plaintiff equal protection and equal benefit of law as guaranteed to her by s. 15(1) of the Charter. The conduct of the investigation and, in particular, the failure to warn was motivated and informed by the adherence to rape myths as well as sexist stereotypical reasoning about rape, about women, and about women who are raped... Women were treated differently because some members of the force adhered to sexist notions that, if warned, women would panic and scare off the attacker...."