1. The number of motor vehicle drivers is more than 300 million in 2014 in China;Chinairn,2016
2. Annual reports on drug control in China 2000–2015;China National Narcotics Control Commission (CNNCC),2016
3. Harm of drug abuse (drug driving) on traffic safety in China;Chen;Chinese Journal of Traumatology,2012
4. Reducing cannabis-impaired driving: Is there sufficient evidence for drug testing of drivers?;Hall;Addiction,2007
5. Single convention on narcotic drugs, 1961 as amended by the 1972 protocol;International Narcotics Control Board (INCB),1975