14 Marijuana Labs Participate in ‘Proficiency’ Test

Yet another sign that the marijuana industry is maturing: 14 cannabis labs from across the country recently participated in a test to determine THC concentrations in blind samples.

The Intra-lab Comparison and Proficiency Test was part of “an effort to help promote quality assurance in a previously unregulated and fast-growing industry,” according to a press release from Emerald Scientific, a testing equipment provider that oversaw the study.

The labs, located in five states, each tested a cannabis sample for THC concentration using their own internal methods. Several industry supply labs, a university and a state health agency also participated.

A testing company that meets criteria established by the International Organization for Standardization (ISO) managed the process and collected the data.

Out of 19 reported results, three labs were within 1% of the true THC concentration, another 13 were within 10% of the number, and the furthest was off by 32%.

Other details – including the results of individual labs – were not released. Full results of the test will be available in January.

Daily News | Ancillary Marijuana Companies | Briefs


  1. Ean Seeb October 16, 2014
  2. Windy City October 16, 2014
  3. Ken Snoke October 17, 2014
  4. Jahpharmer October 21, 2014
  5. Carl Meuser October 22, 2014
  6. Lonnie Painter October 23, 2014
  7. Mendo Bruce January 20, 2015
  8. Mendo Bruce February 2, 2015

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