Understanding Variance in Results from Cannabis Testing Labs

Ricardo Baca with Edipure and Nordic Analytical

Colorado has endured 14 recalls recently due to issues with pesticide contamination, and the state is developing a reputation for being way behind in developing a sound regulatory framework for the cannabis industry.  The Cannabist discussed the issue of variance in lab results on a recent weekly episode.

EdiPure chief science officer Malcolm Morrison and Nordic Analytical Laboratories lab director Joseph Evans answer questions with Denver Post marijuana editor Ricardo Baca.

The trio discuss the recent Denver recalls on pot products due to pesticides, and the variances allowed in testing procedures under current Colorado law.


  • There is much variance in the results from lab to lab, but this doesn’t mean that there is poor quality.
  • Testing equipment and methods vary from lab to lab
  • There needs to be a common reference
  • Even the FDA allows variance of 20%
  • Testing flower is more complex than testing a pharmaceutical (environmental analysis allows for 25% variance)
  • 10-15% variance should be expected

Read “Are cannabis testing labs trustworthy, and why do their results vary?”: http://www.thecannabist.co/2015/12/22/cannabis-testing-labs-why-do-results-vary/45519/

Published by NCV Newswire
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