Ticket from DOT for Ontario pmvi safety

Thus what I could find,

I would call your Saskatchewan transportation department and ask them, and get them to send you the relevant regulations. If they say you are good, challenge the ticket.
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Saskatchewan-registered semi-trucks operating out-of-province must adhere to periodic commercial vehicle inspection requirements, generally needing a safety inspection every 12 months for extra-provincial operation. If a recently purchased out-of-province trailer/semi is being registered in Saskatchewan, it must pass an SGI-approved mechanical safety inspection, unless it is under four years old, has a clean Inter-Provincial Records Exchange (IRE) status, or was inspected under a recognized NWP program within the last 90 days

 

Looks to me like it would be, but as I said call whatever Saskatchewan calls their transportation department and get them to confirm.

To win in court you need to show the regulation that proves the ticket is invalid as the Ontario inspection is valid. Without that they will take the officers word over yours.

Look up the regulation the officer cited on the ticket. What does it say?