Bay State regulators have suspended the license of a marijuana testing facility over allegations it failed to report yeast and mold test results to the Cannabis Control Commission.

According to Summary Suspension Order issued to Assured Testing Laboratories, LLC, the Tyngsboro-based lab was noncompliant enough that their actions pose “an immediate and serious threat to the public health, safety, or welfare of the Commonwealth.”

The order instructs the testing facility to cease operations as of July 4, and gives them 21 days to request for a hearing over the commission’s action. Assured did not immediately return a request for comment.

The suspended testing lab, was responsible for testing about 25% of the marijuana certified as safe in the state, according to commission data.

The commission alleges that, despite that volume, of 17,565 marijuana samples analyzed by the lab in the year between April 2024 and April 2025 only 10, or 0.05%, were found to contain mold or yeast above the state’s statutory limits. The rest of the state’s 11 testing facilities found an average contamination rate of 4.5%, according to the suspension order.

“When compared to the industry average, lab samples analyzed by (Assured) were ninety times less likely to fail for the presence of Total Yeast and Mold,” the commission said.

More 7,000 samples tested by Assured during the one year period and certified as “none detected” or as free from yeast or mold actually did contain contaminants, the commission alleges, and 544 of those samples showed levels above the state’s limit.

“(Assured) did not report any of those failures to the Commission,” the suspension order reads, in part.

A CCC spokesperson said that the suspension is part of the Commission’s commitment to ensuring the industry they regulate is safe for Bay State adults to enjoy.

“The Cannabis Control Commission remains vigilant in its efforts to ensure consumers and patients have access to fairly and accurately tested products in the marketplace,” the agency told the Herald.

The suspension order comes after the commission held a meeting with licensed Independent Testing Lab representatives in November, ahead of creating a taskforce charged with investigating work at the labs.

At that meeting, regulators were warned that some labs were providing questionable results for clients in order to corner the testing market. The commission said they were forming the taskforce to look into precisely those sorts of concerns. The decision to suspend Assured’s license was the result of just such an investigation.

“The Summary Suspension Order issued this week follows an investigation led by the Investigations & Enforcement Taskforce focused on improving product testing as part of the Commission’s mission to oversee a safe, equitable cannabis marketplace in Massachusetts. Through this Taskforce, the Commission will continue to verify the practices of licensees and take necessary action to ensure products sold through the adult- and medical-use markets are safe,” the Commission spokesperson said.

According to the commission, Bay State residents with questions about their dispensary products can ask their marijuana retailer for information about who performed the testing and how to dispose of potentially contaminated batches. The suspension order also requires the lab to make an employee available to answer questions from growers and retailers.