What to do about a crop that carries something it should not: pesticide residues, heavy metals, microbial contamination and mycotoxins. Detection, the limited set of remediation options, and the point at which a batch is simply not saleable.
The order of work is prevention, detection, then remediation, and the third is the weakest of the three. Ozone and irradiation reduce microbial counts but do nothing about a systemic pesticide, extraction can concentrate a contaminant rather than remove it, and no common process reliably strips heavy metals taken up through the roots.
Two things are worth stating plainly. A product destined for a regulated market is tested against that market’s limits rather than the producing country’s, and a batch that passes in one place can fail in another on the same certificate. And remediation has a compliance dimension: for certified production under GACP and GMP, an undocumented attempt to clean a failed batch is itself a finding, which is why the paperwork around a deviation matters as much as the treatment.
There are no reference articles in this sub-board yet; the related threads below are where the subject is currently covered.
Related elsewhere on the forum: How to Read a Cannabis Certificate of Analysis in Testing and Analytics, and Integrated Pest Management for Cannabis in Diseases, Insects and Mites.