Colorado Marijuana Regulators Failed to Prevent Contaminated Products From Reaching Consumers, State Audit Finds
A state audit found that Colorado's Marijuana Enforcement Division allowed nearly 75% of processed marijuana to skip pesticide testing and delayed warnings about contaminated products by months or years.
What happened
A state audit released Monday found that Colorado's Marijuana Enforcement Division failed to adequately protect consumers from contaminated marijuana products. Nearly 75% of marijuana processed for sale from 2023 through 2025 evaded pesticide testing due to loose state rules and inconsistent oversight. Regulators missed regular inspection schedules, conducted insufficient random checks at dispensaries, and delayed public warnings—allowing contaminated products to remain on shelves for as long as three years. On average from 2023 through 2025, products subject to safety advisories stayed on shelves for more than seven months after investigators identified contamination, and it took the agency an average of three and a half months in 2025 to issue an advisory after launching an investigation. One case took 15 months for a manufacturer to stop producing a marijuana sleep aid that consumers reported was harming their livers.
Context
Colorado's marijuana market, the first legal recreational market in the nation, is now shown to rely heavily on an honor system: marijuana businesses collect their own samples for testing rather than submitting to independent third-party collection as more than half of other regulated states do. This self-sampling system increases the risk that businesses select unrepresentative samples. The Marijuana Enforcement Division abandoned a planned overhaul requiring private lab personnel to collect samples after manufacturers said it would increase costs, citing geographic challenges for rural businesses as justification. The audit found that more than half of MED investigators surveyed believe there may be widespread marijuana product safety issues in Colorado's regulated market. While auditors did not identify evidence of widespread health and safety issues, they concluded that deficient regulations still leave consumers vulnerable to inaccurately labeled potency and contaminated products.
What's disputed
The Marijuana Enforcement Division emphasized that state auditors found no evidence to support claims of widespread health and safety issues, distinguishing this from the audit's finding that vulnerabilities remain and from investigators' own concerns about potential safety issues.