Fig. 2From: Randomly controlled drivers using minimally invasive sampling: assessment of drug prevalence in Western Switzerland over two time periodsParticipants positivity for at least one substance impairing driving ability. Comparison based on the road type (A) and the time period within the day (B) and week (C). The time period comparison for young drivers (< 35 years old) is presented in Panel (D) regarding illicit drugs. N.b.: one driver can be positive for both illicit and pharmaceuticals at the same timeBack to article page