Sure.
Just briefly in response to your earlier comment, Mr. McKinnon, our Supreme Court has recently made it easier for officers to testify as drug recognition experts without requiring a full litigation, a full voir dire, or a trial within a trial as to their qualifications. Our courts are responsive to the cases that come before them, and with proper training I don't anticipate that the legalization of cannabis is going to place additional burdens on our court systems.
In relation to the way the crown exercises discretion, that's typically done through the Attorney General. They would have policy guidelines in place that would indicate what sorts of factors contextually characterize each case that would give the crown some direction as to whether something should be simply diverted and not result in any kind of a criminal charge, whether it should be proceeded with by way of summary conviction, which is less serious, or whether there are factors that overlay the case such as a prior serious conviction or whether there is the presence of organized crime or some type of criminality that would mandate proceeding by way of indictment.
To answer your question, those guidelines would come through the Attorney General and would form part of the crown policy manual.