BJCC
Don't try to make the report something its not.
The report is a study about drug and alcohol use in 1184 road deaths, most occurring in 2000.
Nothing to do with the courts or any prosecution. There were no prosecutions because the samples were taken from fatalities.
Blood and urine samples were collected, and the urine samples were analysed to identify whether alcohol or drugs were involved. Assumptions were made about amount of alcohol in blood from a measure of the amount in urine, for purposes of showing whether alcohol was involved.
What it shows is that drug use has risen to 24% of fatal injury accidents (rising from 7%) with alcohol at around 31% i.e. drug use has grown dramatically and is responsible for almost as many road deaths as alcohol.
It makes no difference to my point - urine should not be used, especially where the sample is small.