This interview by Mark Taliano suggests that there is a deliberate process on the part of the Canadian government of undermining US-Canada commodity trade, even in the case when the truck drivers have all the required documents.
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The original source of this article is Mak TalianoCopyright © Mark Taliano, Mak Taliano, 2022
Coercion Code - "Dark Times are upon us" 
My brother’s roommate in the year 2020, his job was to pick up cattle by the truck loads to be slaughtered due to this so-called Corona Virus, none of it could be used for human consumption. He did this job for maybe 1 1/2 years.
I had read also, that in the U.S. farmers were ordered to destroy their crops.
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April 2020 – “Millions of farm animals culled as US food supply chain chokes up”
US government vets said to be ready to assist with culls, or ‘depopulation’ of pigs, chickens and cattle because of coronavirus meat plant closures
Covid-related slaughterhouse shutdowns in the US are leading to fears of meat shortages and price rises, while farmers are being forced to consider “depopulating” their animals.
At least two million animals have already reportedly been culled on farm, and that number is expected to rise.
https://www.theguardian.com/environment/2020/apr/29/millions-of-farm-animals-culled-as-us-food-supply-chain-chokes-up-coronavirus