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Yes; they are illegal. Possession, manufacture or sale of spring knives (a butterfly knife is a spring knife under Washington state RCW 9.41.250 (2012) and would include practice butterfly knives) is a gross misdemeanor, punishable by imprisonment in the county jail for up to 364 days or a fine of up to $5,000 or both.

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Q: Are practice butterfly knives illegal to make in Washington state or buy one?
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