Justin Trudeau and Katy Perry enjoy meal at Montreal restaurant

It’s unnerving to read a government document describing how to properly cut a cow’s throat. But in order to understand the lawsuit between the producers of kosher meat, kosher certification agencies, and the Canadian Food Inspection Agency (CFIA), which regulates the health of food, animals, and plants, one has to face certain realities. Since 2010, the CFIA’s guidelines for ritual slaughter—the act of killing an animal to fulfill specific religious or cultural laws—have described in detail the method of using a knife “at least twice as long as the animal’s neck width and...