(1) Cannabinoid concentration analysis, previously known as potency, is intended to quantitate and accurately report cannabinoids above the lower limit of quantitation as described in chapter 314-55 WAC.

(2) Laboratories must use a method approved by the department to analyze cannabinoids.

(3) Laboratories must limit batch size to 20 samples in a preparation batch not including quality controls.

(4) ICV, CCV, and surrogate must meet a minimum of 80-120 percent recovery for each analyte.

(5) LCS and matrix spike samples must meet a minimum of 70-130 percent recovery for each analyte.

(6) Sample and matrix spike duplicates must have a relative percent difference (RPD) value of less than 20 percent.

(7) Chromatographic performance must be described in method and must include, but is not limited to, the following criteria:

(a) Tailing factor less than 2.0;

(b) Column performance resolution greater than 1.0;

(c) Retention time shift less than two percent.