In 2011 the Ministry of Transport commissioned the Institute of Environmental Science and Research Limited (ESR) to reanalyse, for research purposes, blood specimens taken under provisions of the Land Transport Act 1998.
The research covered three groups of drivers and looked for the presence of drugs that could potentially affect driving. The three groups were:
- drivers hospitalised following a crash for which they were deemed to be at fault
- drivers who had tested positive for methadone
- drivers whose blood specimens were taken under the drug-driving legislation but, no drugs had been detected in their blood
This type of research enables the Police and Ministry of Transport to monitor what drugs are present in drivers’ blood and helps to inform future policy development and operational practices relating to drug driving.