Many states in the U.S. have legalized cannabis either medically or recreationally, but without legalization at the federal level regulation is left to states, including testing for contaminants and THC levels. New reporting from Undark, an online science magazine, found that in some states, including Oregon, independent labs were inflating THC level numbers and providing fraudulent results. Teresa Carr, a senior contributor at Undark, joins us to share more on lab testing and what some states are doing to combat fudged results.