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"Laughing gas" is more formally known as nitrous oxide. While it's theoretically possible to test for it, it's not normally part of the standard drug tests, and unless you went more or less straight from the dentist to the test, it would be difficult to detect anyway since it's cleared from the body relatively rapidly once administration ceases.

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13y ago
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Q: Can laughing gas from the dentist make you fail a drug test?
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