The number of Mexican visitors to Canada claiming asylum from rising criminal violence in their home country is way up since the Trudeau government dropped the visa requirement in 2016. That move may have helped Canada-Mexico relations but it puts domestic security at grave risk because it makes it easier for Mexico’s powerful drug cartels to expand their operations in Canada. As criminal violence spirals out of control in Mexico and the evidence of it spilling into Canada mounts, Greg Purdy contends a review of the visa-free policy is urgently needed.