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2. ACMD 2013 Ketamine: A Review of Use and Harm www.gov.uk/government/uploads/system/uploads/attachment_data/file/264677/ACMD_ketamine_report_dec13.pdf
3. Acute cannabis consumption and motor vehicle collision risk: systematic review of observational studies and meta-analysis;Asbridge;BMJ,2012
4. Austroads 2013 Assessing Fitness to Drive for Commercial and Private Vehicles. Medical Standards for Licensing and Clinical Management Guidelines www.onlinepublications.austroads.com.au/items/AP-G56-13