Depending on the scenario, the person would either be handed over to the local police jurisdiction for proceedings to take place or, depending on the nature of the criminality, the case could be viewed by the CBSA as an admissibility question, which would first be cleared up before the process continued for that individual. Necessary actions would be taken at that point, depending on the nature of the offence.
On September 28th, 2017. See this statement in context.