The Nova Scotia shooting and the mistakes the RCMP may have made

Stephen Maher has spent weeks digging into the aftermath of the horrific mass murder in Nova Scotia that ended with 22 lives lost. Now, Maher reports that new information is "raising serious questions about the way the RCMP handled the nightmarish onslaught." Some law enforcement officials, he writes, are now wondering if at least some of the deaths could have been prevented. Maher asks six key unanswered questions about the killings.