Farmer discovers that an isolated portion of his canola crop is somehow 60% GMO

That's no what happen. Read your link, in particular:

As established in the original Federal Court trial decision, Percy Schmeiser, a canola breeder and grower in Bruno, Saskatchewan, first discovered Roundup-resistant canola in his crops in 1997.[4] He had used Roundup herbicide to clear weeds around power poles and in ditches adjacent to a public road running beside one of his fields, and noticed that some of the canola which had been sprayed had survived. Schmeiser then performed a test by applying Roundup to an additional 3 acres (12,000 m2) to 4 acres (16,000 m2) of the same field. He found that 60% of the canola plants survived. At harvest time, Schmeiser instructed a farmhand to harvest the test field. That seed was stored separately from the rest of the harvest, and used the next year to seed approximately 1,000 acres (4 km²) of canola.

He applied Roundup to his canola, killing off the non-RR plants. He then took the remaining plants, which are by then all Roundup Ready, and replanted on 1000 acres. He lost the lawsuit not for contamination, but for intentionally isolating the RR plants and replanting. It would be like if someone littered a movie DVD on your front lawn, you then make 1000 copies can claimed the copyright doesn't apply to you.