Colorado Harvest Company, a vertically integrated enterprise that grows and sells its own natural cannabis, received a perfect score this month from the Colorado Department of Agriculture (CDA) when all 80 tests of cannabis samples taken between August 2015 and January 2016 came back clean.

Tim Cullen, CEO and co-owner of Colorado Harvest Company, said he founded Colorado Harvest Company as a medical marijuana business to sell safe effective products, and when all Colorado Harvest Company stores began selling recreational cannabis, he continued to implement the safest and most natural growing methods.

Cullen, who was a high school biology teacher for 10 years prior to establishing Colorado Harvest Company, was able to apply his scientific knowledge to cultivating cannabis. He said it was that careful approach that resulted in the perfect grade he received from the CDA.

“We set a high standard for ourselves which is an example to the industry,” Cullen said. “The CDA has the best testing equipment in the industry and we’re pleased they have validated our efforts.”

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