1 See NIDA. (2018, June 25). Marijuana. Retrieved from https://www.drugabuse.gov/publications/researchreports/marijuana on 2018, July 2.

2 See Irons, B. M.D., Mayo Clinic. (2015, Feb. 19). Speaking of Health. Retrieved from https://mayoclinichealthsystem.org/hometown-health/speaking-of-health/the-problem-with-kids-and-cannabis on 2018, July 2 and Mayo Clinic Staff. (2017, Oct. 24). Marijuana. Retrieved from https://www.mayoclinic.org/drugssupplements-marijuana/art-20364974 on 2018, July 2.

3 See Cleveland Clinic. (2014, July 29). Marijuana. Retrieved from https://my.clevelandclinic.org/health/articles/4392-marijuana on 2018, July 2

4 See World Health Organization. (2016). The Health and Social Effects of Nonmedical Cannabis Use. Retrieved from http://apps.who.int/iris/bitstream/handle/10665/251056/9789241510240- eng.pdf;jsessionid=3EBC6F1B98621EB7690654FDFB631BEB?sequence=1 on 2018, July 2.

5 See NIDA. (2018, June 25). Marijuana. Retrieved from https://www.drugabuse.gov/publications/researchreports/marijuana on 2018, July 2.

6 See Secades-Villa, R., Garcia-Rodriguez, O., Jin, C.J., Wang S., & Blanco, C. (2014, Aug. 2). Probability and Predictors of the Cannabis Gateway Effect: A National Study. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/25168081 on 2018, July 2.

7 See Olfson, M., Wall, M.M., Liu, S.M., Blanco, C. (2017, Sept. 26). Cannabis Use and Risk of Prescription Opioid Use Disorder in the United States. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/28946762 on 2018, July 2.

8 SeeSerena Stopponi et al., Chronic THC During Adolescence Increases the Vulnerability to Stress-Induced Relapse to Heroin Seeking in Adult Rats, 24 EUR. NEUROPSYCHOPHARMACOLOGY 1037, 1038 (2014).

9 See Center for Behavioral Health Statistics and Quality. (2017). 2016 National Survey on Drug Use and Health: Detailed Tables. Substance Abuse and Mental Health Services Administration, Rockville, MD.

10 See Center for Behavioral Health Statistics and Quality. (2017). 2016 National Survey on Drug Use and Health: Detailed Tables. Substance Abuse and Mental Health Services Administration, Rockville, MD.

11 See https://www.reuters.com/article/us-health-marijuana-kids/marijuana-related-er-visits-by-colorado-teens-onthe-rise-idUSKBN1HO38A

12 See https://www.tandfonline.com/doi/full/10.1080/09540261.2018.1467385

13 See Johnson, T. (2016, May 10). Fatal Road Crashes Involving Marijuana Double After State Legalizes Drug. Retrieved from https://newsroom.aaa.com/2016/05/fatal-road-crashes-involving-marijuana-double-state-legalizesdrug/ on 2018, July 2

14 See Smart Approaches to Marijuana. (2018 March). Lessons Learned from Marijuana Legalization in Four U.S. States and D.C. Retrieved from https://learnaboutsam.org/wp-content/uploads/2018/04/SAM-Lessons-LearnedFrom-Marijuana-Legalization-Digital.pdf on 2018, July 2.

15 See Colorado Department of Public Safety. (2016). Marijuana legalization in Colorado: Early findings. Retrieved from https://cdpsdocs.state.co.us/ors/docs/ reports/2016-SB13-283-Rpt.pdf on 2018, Feb. 3.

16 See Smart Approaches to Marijuana. (2018 March). Lessons Learned from Marijuana Legalization in Four U.S. States and D.C. Retrieved from https://learnaboutsam.org/wp-content/uploads/2018/04/SAM-Lessons-LearnedFrom-Marijuana-Legalization-Digital.pdf on 2018, July 2.

17 See Mitchell, K. (2017, July 11). Crime rate in Colorado increases much faster than rest of the country. Denver Post. Retrieved from https://www.denverpost.com/2017/07/11/colorado-sees-big-increase-crime10-percent-higher-murder-rate/ on 2018, Feb. 3 and Colorado Bureau of Investigation. (2017). National Uniform Crime Reports. Retrieved from https://www.colorado.gov/pacific/cbi/crime-colorado1 on 2018, 2018 Feb. 3.

18 See Highway Loss Data Institute. (2017, August 3). Studies link legalized use of recreational marijuana with increase in crashes. Status Report, 52(5). Retrieved from http://www.iihs.org/iihs/sr/statusreport/article/52/5/3 on 2018, Feb. 3. And Washington Traffic Safety Commission. (2016). Driver toxicology testing and the involvement of marijuana in fatal crashes, 2010–2014. Olympia, WA: Author. Retrieved from http://wtsc.wa.gov/wp-content/uploads/dlm_uploads/2015/10/Driver-ToxicologyTestingand-the-Involvement-of-Marijuana-in-Fatal-Crashes_REVFeb2016.pdf on 2018, Feb. 3.

19 See Smart Approaches to Marijuana. (2018 March). Lessons Learned from Marijuana Legalization in Four U.S. States and D.C. Retrieved from https://learnaboutsam.org/wp-content/uploads/2018/04/SAM-Lessons-LearnedFrom-Marijuana-Legalization-Digital.pdf on 2018, July 2.

20 See https://www.denverpost.com/2018/08/09/driving-while-high-colorado/

21 See Rocky Mountain High Intensity Drug Trafficking Area. (2017). The legalization of marijuana in Colorado: The impact. Retrieved from http://www.rmhidta.org/html/ FINAL%202017%20Legalization%20of%20Marijuana%20in%20Colorado%20The%20 Impact.pdf on 2018, Feb. 3.

22 See Hughes, T. (2017, July 31). Marijuana’s legalization fuels black market in other states. USA Today. Retrieved from https://www.usatoday.com/story/news/ nation/2017/07/31/marijuana-black-market/507417001/ on 2018, Feb. 3, Associated Press. (2017, August 14). Marijuana-legal states struggle with black-market weed. Los Angeles Daily News. Retrieved from https://www.dailynews.com/2017/08/14/marijuana-legal-states-strugglewith-black-market-weed/ on 2018, Feb. 3, and Oregon State Police-Drug Enforcement Section. (2017). A baseline evaluation of cannabis enforcement priorities in Oregon. Retrieved from https://learnaboutsam.org/wpcontent/uploads/2017/04/Oregon-State-Police-reportJanuary-2017.pdf on 2018, Feb 3.

23 See https://www.thelancet.com/pdfs/journals/lanpub/PIIS2468-2667(18)30110-5.pdf

24 See NIDA. (2017, Sept. 26). Marijuana Use is Associated with an increased Risk of Prescription Opioid Misuse and use Disorders. Retrieved from https://www.drugabuse.gov/news-events/news-releases/2017/09/marijuana-useassociated-increased-risk-prescription-opioid-misuse-use-disorders on 2018, July 2.

25 See Quest Diagnostics. (2015, June 9) Illicit Drug Positivity Rate Increases Sharply in Workplace Testing, Finds Quest Diagnostics Drug Testing Index™ Analysis. Retrieved from http://newsroom.questdiagnostics.com/2015-06- 09-Illicit-Drug-Positivity-Rate-Increases-Sharply-in-Workplace-Testing-Finds-Quest-Diagnostics-Drug-TestingIndex-Analysis on 2018, July 2.

26 See Jupe, N. (2018 May 8) Quest Diagnostics Employer Solutions Blog. Retrieved from https://blog.employersolutions.com/drug-testing-index-workforce-drug-positivity-at-highest-rate-in-a-decade/ on 2018, July 2.