Regulators have discovered no sales to minors at pot shops in Colorado during a recent investigation.

Members of the Colorado Marijuana Enforcement Division looked into whether shops in Denver and Pueblo would sell to underage buyers. All the stores passed without any illegal sales, according to an article published by 9news. “We are pleased with the results and will continue to monitor the businesses to ensure that the compliance efforts are maintained,” said Lewis Koski, MED director.

Under Colorado law, sale to a minor has a four year mandatory minimum sentence. Opponents of legalization have previously worried that children would be poorly effected. Former President Jimmy Carter told a workshop hosted by the National Families in Action last year that, “I do not favor legalization…We have to prevent marijuana smoking from becoming attractive to young people, which is, I’m sure, what the producers of marijuana….are going to try and do.”

The MED results push back against the concern that marijuana producers will attempt to target minors. Mason Tvert of the Marijuana Policy Project stated last year, “Forcing marijuana sales into the underground market is the worst possible policy when it comes to protecting our young people,”