More Colorado workers are testing positive for marijuana since the state legalized recreational use of the drug.
Quest Diagnostics, who performs a lot of testing for companies, reported an increase of 20 percent from 2012 to 2013.
More Colorado workers are testing positive for marijuana since the state legalized recreational use of the drug.
Quest Diagnostics, who performs a lot of testing for companies, reported an increase of 20 percent from 2012 to 2013.
