★★☆Single study — solid evidence, such as one good trial or a large observational dataset, but not replicated at the top tier.
18 of 84 CBD extracts held THC that the label never mentioned
Of 84 extracts sold as cannabidiol, 18 held detectable THC at up to 6.43mg/mL. A survey of 25 hemp oils found three over the legal THC limit.
What the study found
About one cannabidiol product in five contained undeclared THC
Of 84 extracts sold as cannabidiol, 18 held detectable THC, the intoxicating cannabinoid, at up to 6.43mg/mL. A survey of 25 Mississippi hemp oils found three over the legal THC limit and four vaping products spiked with synthetic cannabinoids that appeared on no label.
The caveat · Shelves in 2016 and 2020, not now
Both are dated regional snapshots — products bought online in 2016 and in one US state in 2020 — and neither describes what is on shelves now. The synthetic cannabinoids turned up in vaping products specifically, so nothing here says the same of oils or edibles.