Presence of illegal drugs in drivers involved in fatal road traffic accidents in Spain.

This study investigated the presence of illegal drugs in the blood of 285 fatally injured drivers in Spain. Illegal drugs were detected in 10.2% of all samples. Illicit drugs alone were detected in 2.5% and together with other substances in 7.7%. Cocaine was the most common drug detected. The mean number (+/- S.D.) of substances detected was 2.6 +/- 1.2: consisting of 46 illegal drugs, 14 alcohol cases and 16 medicines. Three concentration levels of the different substances have been established: low, medium and high-toxic. In 68.9% of the samples in which an illegal drug was detected, a substance was also found at the high-toxic level. The results show that illegal drugs are commonly detected in road accident victims.