Health officials urge keeping THC potency and serving limits as committee considers S.278

Shayla Livingston, interim deputy commissioner at the Vermont Department of Health, told the House Committee on Government Operations & Military Affairs that the department’s top priorities for cannabis policy are retaining existing THC potency caps, concentration and single‑serving package limits, and preserving advertising and purchase/possession restrictions to limit youth exposure and overconsumption.

“Maintaining the existing THC potency caps, concentration limits, and single serving package limits, to reduce the potential for overuse, dependence, and emergency care are really important,” Livingston said. She told members that the senate version of S.278 does not raise potency caps or alter advertising rules but would increase single‑package size and purchase/possession limits — changes the department urged lawmakers not to accept.

Livingston and Tony Fallen, a clinical subject‑matter expert in the Department of Health’s Division of Substance Use, cited surveillance data that show rises in calls to the New England Poison Center and emergency‑department visits tied to cannabis since Vermont’s regulated market began. Fallen said accidental ingestion calls for children rose from single digits in pre‑market years to the mid‑20s or mid‑30s annually after legalization, and that a growing share of ED records now list cannabis as a primary or contributing factor.

“Sometimes it’s very unintentional,” Livingston said of child poisonings. She emphasized that larger package sizes and packages that are easier for children to open increase the risk of more serious outcomes when accidental ingestion occurs: "The bigger the amount, the worse the outcome for that kiddo."

The Department of Health also described prevention and outreach efforts funded by cannabis excise tax revenues, including safe‑storage campaigns and the “how to talk to your kids” education efforts. Livingston offered to provide the committee with state ED‑visit data, poison‑control call counts and links to the Youth Risk Behavior Survey results for committee review.

Scientific witness Amy Turncliff, PhD, founder and president of Rockford Scientific Consulting, said the National Institute on Drug Abuse defined a NIDA dose unit as 5 milligrams of THC and urged lawmakers to consider what increased package and possession limits mean in those terms. Turncliff illustrated how modern products and vape cartridges can contain hundreds of milligrams of THC and explained that THC is lipophilic — it accumulates in fatty tissues, including the brain, and can be released over days or weeks, making impairment and detection less predictable than alcohol.

Turncliff warned that social cannabis events and relaxed package limits could normalize use, increase youth exposure and complicate enforcement. She recommended local metrics to track effects of events — poison‑control calls, OUI‑cannabis cases, EMS utilization and compliance‑check results — so policymakers can monitor public‑health outcomes as the marketplace changes.

The committee pressed witnesses on causation versus association; Livingston and Turncliff repeatedly cautioned that Vermont’s survey data show associations rather than proven causal links, though longitudinal studies from other jurisdictions suggest a causal connection between adolescent cannabis use and later mental‑health disorders. Both urged a cautious regulatory approach to serving sizes and possession limits while the state continues to monitor health outcomes.

The committee did not vote on S.278 during the hearing; witnesses were invited to supply follow‑up data and to return for further testimony as the bill advances.