(For a more comprehensive discussion of this issue, go to http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1741735.)
“Steep Hill Lab in Oakland, http://steephilllab.com/, conducts potency testing on medical cannabis using a 2 gram sample that statistically represents up to two pounds of medical cannabis. The two gram sample is selected from 5 to 15 sites from the bulk material which has been determined to be sufficient to accurately represent potency. Comprehensive scientific analysis is conducted and a certificate of analysis is generated for potency as well as other important factors such as microbiological contamination and pesticide residue.”
That’s an excerpt from an email to me from Wilson Linker at Steep Hill Lab of December 5, 2010, 9:43:35 PM. He was correcting a draft I had sent him.
The Lab charges $120 per sample for flowers and concentrates. http://steephilllab.com/services/potency-analysis/ (last visited Dec. 6, 2010).