- (1) Accredited labs may reference samples for testing by subcontracting fields of testing to another accredited laboratory.
- (2) Laboratories must maintain the integrity of the sample by testing samples on an "as is" or "as received" basis before sample prep unless otherwise specified in rules.
- (3) Laboratories may use historical calibrations for high complexity testing as long as it is supported by analytical data through quality control results. Historical calibrations cannot extend past 30 days.
- (4) The samples fail quality control testing if the results exceed the limits indicated in chapter 314-55 WAC.
- (5) Sample results are positive for the analyte being tested if their results are greater than or equal to the decision point or cutoff limits as indicated in chapter 314-55 WAC.
- (6) Sample results are to be reported out in the number of digits and units of measure described in chapter 314-55 WAC.
(7) Laboratories may be accredited to conduct the following fields of testing:
| Field of Testing | Level of Complexity |
| water activity | low |
| cannabinoid concentration analysis | high |
| foreign matter inspection | low |
| microbiological testing | |
| culture method | moderate |
| immunoassay method | moderate |
| polymerase chain reaction (PCR) method | high |
| residual solvent testing | high |
| mycotoxin testing | |
| enzyme-linked immunosorbent assay (ELISA) method | moderate |
| liquid chromatography with tandem mass spectrometry (LC-MS/MS) method | high |
| pesticide testing | high |
| heavy metals testing | high |
[Statutory Authority: RCW 15.150.030 and 2022 c 135. WSR 24-09-079, § 16-309-140, filed 4/17/24, effective 5/18/24.]