1. Impaired Driving in Colorado: First Results from a Data Integration Initiative
Becky Bui
Colorado Department of Public Safety
Division of Criminal Justice
Office of Research & Statistics
August 2018

2. National Landscape of Marijuana Laws
Medical & Recreational: 9 States & DC --- Medical only: 22 States --- CBD only: 15 States --- None: 4 States
Source: National Conference of State Legislatures (2018), Note: Not all states’ laws are currently in effect.

3. Varieties of Cannabis and Consumption

4. Delta-9 THC Over Time
Source: Adapted from Toennes, S., Ramaekers, J., Theunissen, E., Moeller, M., & Kauert, G. (2008). Comparison of cannabinoid pharmacokinetic properties in occasional and heavy users smoking a marijuana or placebo joint. Journal of Analytical Toxicology, 32,

5. Delta-9 THC, Subjective High, and Performance Over Time
Source: Berghaus et al. 1998, Sticht and Käferstein 1998, and Robbe 1994 as cited in Compton, R. (2017, July). Marijuana-Impaired Driving - A Report to Congress. (DOT HS ). Washington, DC: National Highway Traffic Safety Administration.

6. Previous Drug Impaired Driving Data in Colorado
Behavioral Risk Factor Surveillance System
Fatality Analysis Reporting System
Study completed by private lab, ChemaTox
Total DUI case filing counts
Total DUI arrests

7. Adults Reporting Driving within 2-3 hours after Marijuana Use
Note: Comparing across years within each age category, there were no statistical differences from 2014 to 2017.
Source: Colorado Department of Public Health and Environment. Behavioral Risk Factor Surveillance System.
URL:

8. Adult Marijuana Users Reporting Driving within 2-3 hours after Marijuana Use
Note: Comparing across years within each age category, there were no statistical differences from 2014 to 2016.
Source: Colorado Department of Public Health and Environment. Behavioral Risk Factor Surveillance System.
URL:

9. Current Data… 2016 Data Breath Tests State Courts Blood Tests (A)
Probation Assessment
Denver Court
Blood Tests (B)
Blood Tests (C)
N = 27,244

10. Fine-Grained Records Integration and Linkage Tool (FRIL)
Source:

11. Fine-Grained Records Integration and Linkage Tool (FRIL)
Source:

12. Fine-Grained Records Integration and Linkage Tool (FRIL)
Source:

13. 2016 Case Counts

14. Gender and Age Associated with Case Filings
75% of case filings were males
Male peak 25
Female peak 24
1/3 are males in their 20s
Highest rate of DUIs per active licenses seen for 23 year olds

15. Toxicology

16. Alcohol Level

17. Delta-9 THC Level

18. Alcohol x THC Level

19. Overall Drug Use, Single Drug

20. Overall Drug Use, Polydrug
Top 5 Other Drugs
Methamphetamine
Alprazolam
Cocaine
Clonazepam
Diazepam

21. Dispositions

22. DUI Dispositions
Total conviction rate: 89%

23. BAC Level and DUI Conviction Rate

24. THC Level and DUI Conviction Rate

25. BAC Level x THC Level and DUI Conviction Rate

26. Single Drug Categories and DUI Conviction Rate

27. Alcohol Only Conviction Rate

28. THC Only Conviction Rate

29. Polydrug Categories and DUI Conviction Rate

30. Contact Information
Becky Bui Colorado Division of Criminal Justice 700 Kipling St., Suite 1000 Lakewood, CO

31. THC Level x BAC Level and DUI Conviction Rate