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Re:Launch HN: SannTek (YC S19) – Breathalyzer for Cannabis by rbobby on Friday August 16, 2019 @03:37PM (#20718879)
Re:Launch HN: SannTek (YC S19) – Breathalyzer for Cannabis by computerex on Saturday August 17, 2019 @08:44AM (#20723742)
From the paper you linked

> Experienced smokers who drive on a set course show almost no functional impairment under the influence of marijuana, except when it is combined with alcohol