In our new series Digging Deeper: Canada's Toxic Drug Crisis, we explore the various components that are contributing to the overdose crisis in Canada. 

Part 1: We speak with former addict Chris Cull, who has lived to tell his story.
 
Part 2: We speak with Traci Letts who is Vice-Chair of Moms Stop The Harm. Traci lost her son Mike to a toxic overdose at the age of 31.
 
Part 3: Dr. Monty Ghosh explains the science behind addiction and the toxicity of drugs.
 
Part 4: Marcus Gee, columnist with The Globe and Mail joins to discuss the pronounced debate on safe supply and supervised consumption.