Massachusetts Cannabis Control Commission protocol requires finished marijuana products to be tested for four metals. The protocol states that Exhibit 4 limits are in micrograms of contaminant per kilogram of product and that the upper allowable limit for heavy metals is 500 ppb for all uses and 1,000 ppb for ingestion-only products. Arsenic and mercury are not speciated in the extracted paragraph, so they are loaded as total arsenic and total mercury.
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