According to Canadian Press “The federal revenue agency can now hand the police possible evidence of serious crime — including terrorist activity — that it happens to come across while reviewing taxpayer files. The Canada Revenue Agency gained the little-noticed new authority, which does not require a judicial warrant, through an amendment tucked into the government's most recent omnibus budget bill.” At the moment CRA is largely muzzled when it comes to sharing information – certainly with the public but even confidentially with other departments.
Here is the article “Revenue agency has new anti-crime powers“. Apparently the power has been around since June 2014 but has not yet been used even once.