[VeniVidiVici]

Her husband, Jules Simon, a York Regional Police officer, was driving behind his wife that night, but little is mentioned about him as a witness in the police report. He pulled over when Brandon was struck, and shortly after both were allowed to go home. It was another witness who pulled over to tend to Brandon and called 911.

Hmmmm. I think I can guess why she wasn't given a breathalyzer.

[CharlesWayneCT]

A couple of people have referred to this as suggesting that they left the scene. But it says "He pulled over when Brandon was struck, and shortly after both were allowed to go home"

I assume "allowed" means other cops on the scene interviewed them and then let them go.

I'm not sure why someone else called 911, maybe there were other cars on the road and someone else called while the police officer was checking on his wife to make sure she was OK. It seems though he might have called it in (have no idea whether off-duty canadian police have police radios with them).