Cannabis use is not positively associated with elevated rates of occupational accidents or injuries

• "There is no or insufficient evidence to support ... a statistical association between cannabis use and ... occupational accidents or injuries."

  The National Academies of Sciences, Engineering, and Medicine, 2017

• Employees who test positive for marijuana in workplace drug tests are no more likely to be involved in occupational accidents as compared to those who test negative. "This study fell short of finding an association between marijuana use and involvement of workplace accidents. ... This study cannot be taken as definitive evidence of absence of an association between marijuana and work related accidents but the findings are compelling."

  Marijuana use and workplace safety: An examination of urine drug tests, Journal of Addictive Diseases, 2014

• "[I]t is not clear that heavy cannabis users represent a meaningful job safety risk unless using before work or on the job; urine tests have poor validity and low sensitivity to detect employees who represent a safety risk; ... [and] urinalysis has not been shown to have a meaningful impact on job injury/accident rates."

  Testing for cannabis in the workplace: a review of the evidence, Addiction, 2010

Liberalized marijuana laws are associated greater labor participation, lower rates of absenteeism, and higher wages

• "Utilizing the Current Population Survey, the study identifies that absences due to sickness decline following the legalization of medical marijuana. ... The results of this paper therefore suggest that medical marijuana legalization would decrease costs for employers as it has reduced self-reported absence from work due to illness/medical issues."

  The Effect of Medical Marijuana on Sickness Absence, Health Economics, 2016

• The enactment of medical marijuana laws is associated with a "9.4 percent increase in the probability of employment and a 4.6 percent to 4.9 percent increase in hours worked per week" among those over the age of 50. "Medical marijuana law implementation leads to increases in labor supply among older adult men and women."

  The impact of medical marijuana laws on the labor supply and health of older adults: Evidence from the Health and Retirement Study, NBER Working Paper No. 22688, 2016

• Marijuana decriminalization is associated with increased probability of employment, particularly for young males, and an average increase of 4.5 percent in weekly earnings. African American males experienced the greatest average wage increase. "This data provides suggestive evidence that marijuana decriminalization laws improve extrinsic labor market outcomes. ... This result is consistent with existing literature that suggests black adults, especially men, stand to benefit the most from removing these penalties."

  Marijuana decriminalization and labor market outcomes, ESSPRI (Economic Self-Sufficiency Policy Research Institute, University of California, Irvine) Working Paper, 2016