What's in the new USVI cannabis testing standards

As of May 20, 2026. The Office of Cannabis Regulation has a complete testing-standards policy in force for every cannabis product grown, manufactured, or sold in the US Virgin Islands. The document, policy number OCR-POL-TEST-052026, was unanimously approved by the Cannabis Advisory Board on May 14 and signed the same day by Executive Director Joanne Moorehead. It is now in effect.

The rules cover medical, adult-use, and sacramental cannabis on equal terms. No product can be transferred to a dispensary or released to a consumer in the territory without passing a defined set of tests at an OCR-licensed laboratory. This is a plain-English read of what those tests are, what they screen for, and what happens when something fails.

The full 19-page policy is hosted here as a PDF.

The Core Testing Panel

Every legal cannabis product in the USVI, regardless of category, has to clear what the policy calls the Core Testing Panel. That panel screens six things.

1. Cannabinoid potency. Labs measure ten cannabinoids at minimum: Δ9-THC, Δ8-THC, THCA, THCV, CBD, CBDA, CBG, CBGA, CBN, and CBC. Labels must be accurate to within ±10%, reported in milligrams per gram (or milligrams per unit for edibles). “Total THC” is computed as Δ9-THC plus (THCA × 0.877), the standard conversion that accounts for what is actually decarboxylated when the plant is heated.

2. Pathogenic microorganisms. Six organisms must be Not Detected in a one-gram sample: Escherichia coli (E. coli), Salmonella species, and four Aspergillus species: A. fumigatus, A. flavus, A. niger, and A. terreus. Aspergillus is the genus of molds that colonizes improperly cured or stored flower. Growers usually catch it as fuzzy gray-green, black, or yellow post-harvest mold inside jars and bags. It is on the panel because it produces aflatoxins (also tested separately) and because immunocompromised patients can develop invasive lung infections from inhaling spores.

3. Microbial load. Even where the named pathogens are absent, total microbial counts are capped. Flower and raw material must keep Total Yeast & Mold under 10,000 CFU/g and Total Aerobic Bacteria under 100,000 CFU/g. Extracts and inhalable concentrates have to be one order of magnitude cleaner: 1,000 and 10,000 respectively. Coliforms and bile-tolerant Gram-negative bacteria are capped at 1,000 CFU/g for flower and 100 CFU/g for inhalables. This is where powdery mildew (PM), Botrytis cinerea (bud rot, gray mold), and the Fusarium species that follow humid cure rooms show up in the lab numbers. In a tropical territory, the math here matters. Yeast and mold grow easily and the policy gives cultivators no slack for that.

4. Heavy metals. Cannabis is a known hyperaccumulator. It pulls metals out of the soil and concentrates them in plant tissue. The action limits are clear:

• Arsenic ≤ 0.2 ppm
• Cadmium ≤ 0.2 ppm
• Lead ≤ 0.5 ppm
• Mercury ≤ 0.1 ppm

These ceilings sit at the strict end of US programs. They also answer a question the Cannabis Advisory Board raised at the May 14 meeting: heavy metals are screened in finished cannabis, not just left to cultivator soil practice. For St. Croix, where the south-shore oil refinery and adjacent alumina plant are the most-named historical sources of contamination, the numeric ceilings give cultivators a target instead of a vague concern.

5. Mycotoxins. Total Aflatoxins (B1, B2, G1, G2) and Ochratoxin A, each capped at 20 ppb. Aflatoxins are what A. flavus produces when flower is stored warm or damp. Ochratoxin shows up on improperly dried material. The panel is required for any inhalable product, raw plant material, or product intended for ingestion. Both contaminants are a real concern in a humid territory.

6. Pesticides. A minimum 60-analyte multi-residue panel applies, with individual limits ranging from 10 to 100 ppb depending on the compound. Any pesticide not affirmatively approved by the OCR must be Not Detected. The approved list is short and biological-heavy: Bacillus strains, Beauveria bassiana, neem oil, azadirachtin, potassium silicate, chitosan, and a handful of similarly minimal-risk inputs. The full prohibited list, which is long, is below.

A separate Foreign and Extraneous Material screen rejects products with visible mold, mildew, hair, insects, insect fragments, metal, plastic, packaging debris, fecal matter, or anything else “reasonably capable of causing contamination or consumer harm.”

Inhalables get more, and a long ban list

If a product is intended for smoking, vaporization, or aerosolization, it carries the Core Panel plus product-specific screens. The most consequential is the inhalable additive ban.

These substances are prohibited in any product meant to be inhaled:

• Vitamin E acetate
• Polyethylene glycol (PEG)
• Medium-chain triglycerides (MCT oil)
• Synthetic terpenes
• Benzoic acid
• Diketones, including diacetyl, acetyl propionyl, and acetoin

This is a noticeably stricter list than what most US state programs require. Vitamin E acetate has been widely banned since the 2019 EVALI outbreak, in which CDC tied vape-pen lung injuries to that single additive. PEG and MCT oil, by contrast, remain legal carrier oils for vape cartridges in much of the country. The OCR’s choice to ban them outright tracks with public-health research suggesting that thermal decomposition of these carriers produces respiratory irritants, even when the additive itself is “food grade.” Synthetic terpenes (the lab-derived flavor blends that mimic strain-specific terpene profiles) and diketones (the buttery flavor compounds linked to popcorn-lung in flavored-vape workers a decade ago) round out a list aimed squarely at consumer respiratory safety.

Naturally occurring cannabinoids and cannabis-derived terpene fractions are explicitly allowed. Added terpenes, if used, are capped at 10% by weight.

Concentrates and extracts also carry a residual solvent panel:

• High toxicity: Benzene ≤ 1 ppm, 1,2-Dichloroethane ≤ 2 ppm, Chloroform ≤ 2 ppm, Ethylene oxide ≤ 5 ppm, Trichloroethylene ≤ 25 ppm.
• Moderate toxicity: Methanol ≤ 250 ppm, Hexane ≤ 60 ppm, Toluene ≤ 150 ppm, Methylene chloride ≤ 125 ppm, Acetonitrile ≤ 60 ppm, Xylenes ≤ 60 ppm.
• Lower toxicity: Butane ≤ 800 ppm, Propane ≤ 2,100 ppm, Acetone ≤ 750 ppm, Ethanol ≤ 1,000 ppm, plus pentane, heptane, ethyl acetate, ethyl ether, and isopropyl alcohol at intermediate values.

Anything not on the approved-solvent list must be Not Detected. These limits are consistent with most US state cannabis programs and follow the structure of USP residual-solvent classifications.

Edibles, topicals, tinctures

Edibles get an additional homogeneity requirement: cannabinoid distribution across a batch must show ≤ 15% relative standard deviation and ≤ 15% potency variance. In plain terms, the gummy at the top of the bag has to test within 15% of the gummy at the bottom. A 10 mg label has to mean 10 mg.

Topicals and tinctures hit the Core Panel and pick up microbial testing where water-based, plus residual solvents where extracts were used. They escape some of the inhalable-specific restrictions because the route of administration is fundamentally different.

What pesticides are banned

The prohibited-pesticide list in OCR-POL-TEST-052026 is long and includes every class of synthetic insecticide that has caused historical concern in cannabis cultivation:

• Organophosphates: Acephate, Chlorpyrifos, Dichlorvos, Diazinon, Dimethoate, Ethoprophos, Malathion, Methyl parathion, Mevinphos, Naled, Phosmet, Coumaphos.
• Carbamates: Aldicarb, Carbaryl, Carbofuran, Methiocarb, Methomyl, Oxamyl, Propoxur.
• Pyrethroids and synergists: Bifenthrin, Cyfluthrin, Cypermethrin, Permethrin, Prallethrin, Pyrethrins, Piperonyl butoxide, MGK-264.
• Neonicotinoids: Acetamiprid, Imidacloprid, Thiacloprid, Thiamethoxam.
• Fungicides: Azoxystrobin, Boscalid, Dimethomorph, Fenhexamid, Fenoxycarb, Fludioxonil, Kresoxim-methyl, Metalaxyl, Myclobutanil, PCNB, Propiconazole, Tebuconazole, Trifloxystrobin, Daminozide.
• Plus a long list of other miticides, insecticides, and plant growth regulators.

Myclobutanil is the headline here. It is the active ingredient in Eagle 20, a systemic fungicide that turns into hydrogen cyanide gas when combusted. The 2017 Colorado recall scandal was built around dispensaries selling Eagle-20-treated flower. Every serious regulated cannabis market has banned myclobutanil since. The USVI joins that consensus.

The policy also bans pesticide application directly to harvestable flower after the onset of flowering for inhalable products, bans all pesticide use during drying, curing, or storage, and bans fumigation, fogging, or any combustion-based delivery. Only food-crop, hemp, or minimum-risk-labeled products may be used. And then the catch-all that closes the loophole: any pesticide not affirmatively listed in the standards is prohibited.

The labs themselves

The standards also redefine what counts as a “lab” for compliance purposes in the USVI. Every testing laboratory must:

• Hold current ISO/IEC 17025 accreditation, the international standard for testing-lab competence.
• Operate independently from cannabis cultivation, manufacturing, or dispensary operations. Common ownership is prohibited. No lab may test products it has a financial stake in.
• Use validated analytical methods and participate in proficiency-testing programs.
• Achieve method detection or quantitation limits at or below one-tenth of any applicable action limit, where feasible.
• Report all results directly into the OCR-approved Inventory Tracking System (Metrc), not in a separate file.
• Make every Certificate of Analysis accessible to consumers via QR code on the product label.

ISO/IEC 17025 is the standard used by accredited labs in every mature regulated cannabis market, from Colorado to Germany. The St. Croix cannabis testing lab now in construction is the first facility being built to meet that standard inside the territory.

Lab independence rules out a vertically integrated “captive lab,” a structure that has caused recurring problems in California and elsewhere, where dispensaries owned the labs that certified their own products.

When a batch fails

Any test result above an action limit is a fail. Any unidentified contaminant the OCR judges a public-health risk is a fail. So is any detection of a prohibited substance.

When a batch fails, it goes into immediate quarantine. The licensee must stop transfer or sale, notify OCR, and follow whatever destruction or remediation order the OCR issues. Remediation is allowed where OCR permits it, but only with documentation, retesting, and full panel re-passes before release. The policy is explicit that no remediation process may be used to “conceal, dilute, or otherwise mask” failed results without OCR approval and a validated protocol. Failed batches cannot be subdivided, relabeled, diluted, or combined with other batches to engineer a passing average.

Products contaminated with prohibited substances, or anything the OCR deems unsafe, may be ordered destroyed and cannot be remediated at all.

One early-warning mechanism is worth flagging. Results at or above 75% of any action limit must be reported to the OCR, not just failures. That means cultivators trending toward a heavy-metal or microbial threshold show up on the OCR’s radar before a batch actually fails, which is the kind of tool that catches problems while they are still fixable.

Where this puts the USVI

These standards put the USVI in the strict tier of US programs. The heavy-metal ceilings match the tightest state limits in the country. The inhalable additive ban is broader than what most states require. The pesticide-prohibition list, with its catch-all clause, is closer to Massachusetts and New York than to states with looser regimes. ISO/IEC 17025 accreditation is the international floor for serious testing, not a stretch goal.

The policy answers, in writing, the concerns the Cannabis Advisory Board raised on May 14: heavy metals are screened, microbial counts are tighter for inhalables, and inhalable additives that have caused real consumer harm in other markets are off the table. It also gives the fourteen conditional commercial cultivators awarded licenses in October 2025 a fixed compliance target that did not exist a month ago.

What it does not do is shorten the timeline. The standards are a precondition for retail sale. They are not the only one. A Certificate to Operate still has to issue. The St. Croix testing lab still has to finish construction and certify to ISO/IEC 17025. The autumn-2026 target for first regulated sales depends on all of those steps clearing in sequence.

What to watch

• Publication of OCR-POL-TEST-052026 on ocr.vi.gov, where it has not appeared as of this writing.
• ISO/IEC 17025 accreditation of the St. Croix testing lab.
• The first Certificate to Operate issued for a commercial cultivator.
• Any retail-side rule changes that follow, particularly around the QR-accessible Certificate of Analysis on product labels.
• The next Cannabis Advisory Board meeting on June 25, where remaining program rules are likely to come up.