Table 1 Substances included, cut-off limits and concentration groups used to estimate degree of substance influence

Alcohol (ethanol) ^a

0.01

0.05–0.10

0.11–0.15

0.16–0.25

≥0.26

Illicit drugs

 Amphetamines^b

4/4.5

70–270

271–554

555–1052

≥1053

 Cannabis (tetrahydrocannabinol)

0.15

0.6–2.8

2.9–4.7

4.8–9.7

≥ 9.8

 Cocaine

6

60–243

244–515

516–789

≥ 790

Medicinal drugs

 Alprazolam

5

15–46

47–97

98–147

≥ 148

 Clonazepam

5

9–47

48–98

99–148

≥ 149

 Codeine

3

90–286

287–603

604–920

≥ 921

 Diazepam

29

85–313

314–654

655–996

≥ 997

 Flunitrazepam

0.8

1.6–6

7–12

13–18

≥ 19

 Methadone

30

123–433

434–896

897–1360

≥ 1361

 Morphine

3

15–54

55–140

141–284

≥ 285

 Nitrazepam

7

14–53

54–110

111–166

≥ 167

 Oxazepam

143

583–1118

1119–2265

2266–3411

≥ 3412

 Zolpidem

8

46–104

105–212

213–430

≥ 431

 Zopiclone

10

35–66

67–136

137–206

≥ 207