Section 15-22-5.12 - Required Formulas5.12.1 The cannabis testing entity shall prepare and analyze at least one of each of the following QC samples for each analytical batch:B. Laboratory control sample (LCS); andC. Matrix spike sample; andD. Duplicate matrix spike sample.5.12.2 The cannabis testing entity shall analyze, at minimum, a continuing calibration verification ("CCV") sample prior to sample testing on each testing day and continued periodically during the analytical batch run no less frequently than once after each set of twenty (20) samples and at the end of each run. The CCV shall be a standard that is not from the same vendor/lot that is used for the calibration curve.5.12.3 If the result of the chemical analyses is outside the specified minimum acceptance criteria in Appendix A, Table 3, the cannabis testing entity shall determine the cause and take steps to remedy the problem until the result is within the specified acceptance criteria.5.12.4 A cannabis testing entity shall use the following calculation for determining Relative Percentage Difference (RPD): RPD = (|Num1-Num2|/((Num1+Num2)/2)) x 100
Where:
Num1= Original Number
Num2= Second Number
5.12.5 A cannabis testing entity shall use the following calculation for determining Relative Standard Deviation (RSD): Click Here To View Image
5.12.6 For calculating both RPD and RSD if any results are less than the LOQ, the absolute value of the LOQ is used in the equation.5.12.7 If any analyte is detected above any action level, as described in this Part, the sample shall be re-prepped and reanalyzed in replicate within another analytical batch.5.12.8 For quantitative analyses, the re-prepped sample and its associated replicate shall meet the acceptance criteria of RPD <=20%.5.12.9 For qualitative analyses, the re-prepped sample and its associated replicate results shall concur.5.12.10 If any quality control sample produces a result outside of the acceptance criteria, the cannabis testing entity cannot report the result and the entire batch cannot be released for retail sale. The cannabis testing entity shall determine the cause and take steps to remedy the problem until the result is within the specified acceptance criteria.5.12.11 If the cannabis testing entity determines that the result is a false-positive or a false- negative, the Department may ask for the cannabis testing entity to re-sample or re-test.5.12.12 The cannabis testing entity shall compile and generate one LQC sample report for each analytical batch that includes LQC acceptance criteria, measurements, analysis date, and matrix.15 Miss. Code. R. 22-5.12