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My 13 year old son wants to buy a butterfly practice/training knife. What are some good reasons not to allow him to get one? I've checked, and these knives are legal in
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Butterfly Knife, Trainer Practice Tool Steel Metal Folding Knife Unsharpened Butterfly Knife Comb for Practicing Flipping Tricks (Black and Silver, Set of 2) : Amazon.ca: Sports & Outdoors
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