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Ethics statement The studies involving human participants were reviewed and approved by the Yale Human Investigation Committee and the Yale-New Haven Hospital Radiation Safety Committee

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The high participation of females suggests that the results are more robust for young females

"Blood should be collected at the start of any impairment evaluation or collected roadside by trained police officers." Better tests for marijuana impairment could also be developed, such as ones that detect THC in dried blood or in the breath, but a lot more research is needed for such tests to become feasible, the researchers noted