I cant say exactly what the regulations in canada are aboot, but from what I have seen in Merican facilities, when animal quality is poor often times the glands and organs have tell tale signs of disease....so to hide the fact that there are diseased animals being approved for human consumption regulators place bans on certain glands and organs writ large, because inspecting individual organs for blemishes is more trouble than its worth...
I have personally witnessed grass fed animals with swollen joints and liver cyst have all their organs condemned, while the rest of the animal is approved and passed through the line...This is standard practice and nobody in position of regulatory power will publicly admit there is a problem.
This is why I source my own animals directly from the farm....
Try looking up local craigslist ads for quality farms..... Ask around about small ma and pop butcher operations...become extremely proactive...seek and ye shall find.