Sometimes the law is a horse's patootie.

Hey, fellahs, listen to yourselves! Instead of looking at the law and saying, "Wow! I can grow mushrooms in this!" you're playing Talmudic games around it. So:

what is the purpose of this law, and is it so constructed to accomplish it without doing other harm?

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If they can get you asking the wrong questions, they don't have to worry about the answers.