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With the recent legalization of marijuana in many states, I have noticed, more and more, an old claim - that smoking marijuana makes users tongues turn green.

Is this true and if not, where did this tale come from?

Apparently, Law Enforcement Officers are checking the tongues of drivers looking for a green tongue as an indicator of marijuana use.

I can't find any Police Department that has a written policy on this but it seems to be prevalent throughout the United States. There are numerous criminal defenses that indicate that the officer used it as a basis for an arrest. Hopefully the fact that people are being arrested and jailed based on this is enough to make this a notable claim.

Is a green tongue enough for a dui arrest

The Fallacy of the Green Tongue

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    At the moment, this question gives two links, both of which refute the claim. One says where the tale comes from. The other provides references (via a court document). Can you explain why you aren't satisfied by these documents? What is left for us to answer? – Oddthinking Oct 20 '17 at 23:44
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    (Also: If people are being arrest and jailed based on the claim, it would make it notable, but it would be better to have a link to show that is the case. – Oddthinking Oct 20 '17 at 23:45
  • One, Two alleged incidents of DUI arrest for 'green tongues.' – Jeff Lambert Oct 23 '17 at 0:00
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    I don't have a reliable source, but this claim is just obviously ridiculous. Half my highschool would have had green tongues if this were the case, and I don't think I've ever even seen a green tongue before. – Carcigenicate Oct 26 '17 at 14:28

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