Table 1.

Grading system to evaluate the extent each drug would contribute to drowning

Grade	Effect
0	None
1	Not probable
2	Fairly improbable
3	Cannot be excluded not confirmed
4	Cannot be excluded
5	Quite probable
6	Probable

Adapted from Lillsunde P. Blood. In: Drugs and driving - analytical and epidemiological aspects. Publications of the National Public Health Institute; 1996:29–30-31 with author’s permission