No I would second that.
When you are off duty you can stop vehicles in situations that you see fit any where in Ontario w/the acception of within the confines of CFB bases, air-ports, native reserves, and within Parliment Hill. Once you are sworn in as an officer of the peace to represent the Queen you have juridiction over the land where the Queen governs. But upon stopping the vehicle you MUST call in an ON-DUTY officer within that juristiction to write up whatever offence that you caught the individual committing. Failure to call in and take notes is one of the many violations dictated by the Police Services Act of Ontario.
Example case my buddy got stopped by ETF a couple years ago on Shepard and Don Mills. The ETF unit must’ve been on their way back to their Grayon Hall outfit in North York. The ETF made him sat in his car and called in for a 31 Div TPS to write him up for a red-light violation.