A calamitous mix-up at a Portland marijuana bottling plant apparently originated with a single employee who confused two similar buckets with nearly identical identification numbers, according to a state investigative report.

The report does not specify, though, whether manufacturer Curaleaf had any quality control measures in place to catch such mistakes, and state investigators withheld some key details of their findings.

Nevertheless, the report – obtained by The Oregonian/OregonLive through a public records request – is the first direct account of how Curaleaf confused bottles of marijuana drops with those containing CBD, a wellness product that doesn’t have psychoactive properties.

Following Curaleaf’s blunder, at least a dozen people who thought they were taking benign CBD drops reporting becoming ill after ingesting jumbo doses of THC, the psychoactive ingredient in marijuana.

At least five customers reported going to the emergency room after taking the mislabeled drops; two said they were driving when they were incapacitated by an unexpected marijuana high.

Curaleaf maintains that it complied with state safety requirements, but in a statement this week acknowledged its responsibility in the incident and described several new safety procedures. Among other reforms, Curaleaf said it now tests samples before selling its products. [Read More @ The Oregonian]