 Michigan is preparing to usher in a new era with legal recreational marijuana sales in 2020, but the states largest employers say their pre-employment drug screenings that include cannabis will not change. The states residents already are failing pre-employment drug screening tests at a rate higher than elsewhere in the nation. According to Quest Diagnostics data, the numbers of people who didnt pass pre-employment drug screenings and likely lost potential job opportunities has increased by 31 from 2014 to 2018, and jumped more than 20 between 2017 and 2018, alone. 