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Is the MGC Aspergillus multiplex assay compliant with the California BCC?

Yes. MGC assays are compliant with BCC safety testing regulations

California's Bureau of Cannabis Control cites specifically in 16 CCR 5720 that:

A sample of inhalable cannabis goods shall be deemed to have passed the microbial impurities testing if all of the following conditions are met:

(1) Shiga toxin–producing Escherichia coli is not detected in 1 gram;
(2) Salmonella spp. is not detected in 1 gram; and
(3) Pathogenic Aspergillus species A. fumigatus, A. flavus, A. niger, and A. terreus are not detected in 1 gram.

MGC's 5-color multiplexed Aspergillus assay is indeed compliant it both detects and speciate Aspergillus sp. depending on fluorophore. Aspergillus niger: ROX, Aspergillus flavus: Cy5,  Aspergillus fumigatus: FAM,  Aspergillus terreus: ATTO 425(Cy5.5), and cannabis DNA: HEX