Cannabis Concentrate Regulations in Massachusetts

Legal status and disclaimer

This article is informational only and is not legal advice. Consult a Massachusetts-licensed attorney for guidance on your specific situation.

Cannabis, including concentrates, is legal in Massachusetts for adults 21+ under the 2016 ballot initiative (Question 4) codified at M.G.L. c. 94G ^[1], and for registered medical patients under M.G.L. c. 94I ^[2]. Cannabis remains a Schedule I substance under US federal law ^[3], so anything discussed here is legal only under state law.

The Cannabis Control Commission (CCC) is the state regulator and publishes its rules at 935 CMR 500 (adult use) and 935 CMR 501 (medical) ^[4][5]. Last verified: June 15, 2024. These regulations have been amended multiple times; always check the current CCC-published version.

Possession limits for concentrates

Under M.G.L. c. 94G §7, an adult 21+ may possess:

• Up to 1 ounce (28.35g) of cannabis outside the home, of which no more than 5 grams may be concentrate ^[1].
• Up to 10 ounces of cannabis inside their primary residence, plus the cannabis produced by up to 6 plants (12 per household) ^[1].

The statute defines "marijuana concentrate" as the resin extracted from any part of the plant, and it counts toward the 5g outside-the-home cap regardless of form (wax, shatter, live resin, distillate, RSO) Strong evidence. Registered medical patients have a 60-day supply limit set by their certifying provider, with a default of 10 ounces per 60 days under 935 CMR 501 ^[5].

Potency and product limits

Massachusetts does not cap the THC potency of raw concentrates sold to adults — a distillate cartridge or dab can lawfully test at 90%+ THC Strong evidence. However, edibles and infused products made with concentrate are limited:

• 5 mg THC per serving maximum
• 100 mg THC per package maximum for adult use (500 mg for medical)
• Servings must be physically demarcated when feasible (e.g., score lines on chocolate)

These caps are set in 935 CMR 500.150 ^[4]. Products cannot resemble commercially available candy or be shaped like humans, animals, or fruit — a rule that shaped how MA edible manufacturers design branding ^[6].

Manufacturing, testing, and packaging

Only licensed Marijuana Product Manufacturers may produce concentrates for sale. Licensees must:

• Use closed-loop extraction systems certified by a licensed engineer if using hydrocarbons (butane, propane) or CO₂ under pressure ^[4].
• Follow food-safety-equivalent standards for infused products.
• Submit every production batch for testing at an Independent Testing Laboratory (ITL) for cannabinoid potency, residual solvents, pesticides, heavy metals, mycotoxins, and microbial contamination per the CCC's Protocol for Sampling and Analysis ^[7].
• Package products in child-resistant, opaque, resealable containers with the CCC symbol, THC/CBD content per serving and per package, batch number, and required warnings ^[4].

Vape cartridges have faced additional scrutiny since the 2019 EVALI outbreak; MA temporarily banned all vape sales in September 2019 and reopened the market in December 2019 with new vitamin E acetate testing requirements ^[8].

Home extraction is a crime

M.G.L. c. 94G §13(b) makes it a felony to manufacture cannabis concentrate using a flammable solvent (butane, propane, ether, etc.) outside a licensed facility, punishable by up to 5 years in state prison ^[1]. This applies even to adults who could otherwise lawfully possess cannabis.

Solventless extraction (dry sift, ice water hash, rosin pressed with heat and pressure) at home is a gray area — the statute targets "volatile solvents," and water and mechanical separation are not solvents in that sense Disputed. There are no published Massachusetts appellate cases squarely on point as of the verification date. Practitioners generally consider home rosin pressing from personally-grown flower to be permissible for personal use, but this is not settled and enforcement discretion varies.

Public consumption and driving

Consuming cannabis — including dabbing or vaping concentrate — in any public place is prohibited under M.G.L. c. 94G §13(a), with a civil fine of up to $100 ^[1]. Landlords and employers may restrict use on their property. Driving under the influence of cannabis is illegal under M.G.L. c. 90 §24 ^[9]; Massachusetts does not have a per se THC blood limit, and the SJC has ruled that field sobriety tests are not conclusive of cannabis impairment (Commonwealth v. Gerhardt, 2017) ^[10]. Concentrates, because of higher THC per dose, can produce impairment faster and longer than flower Strong evidence.

Recent and pending changes

• Chapter 180 of the Acts of 2022 ("An Act Relative to Equity in the Cannabis Industry") changed host community agreement rules and created a Social Equity Trust Fund; it did not change concentrate-specific rules but did affect who can hold manufacturing licenses ^[11].
• The CCC finalized revised 935 CMR 500 in October 2023, tightening rules on suitability review and social equity licensing ^[4].
• No THC potency cap for concentrates has been enacted as of the verification date, though similar caps have been proposed in other states.

Last verified: June 15, 2024. For current text, always consult mass.gov/cannabis-control-commission and the official Code of Massachusetts Regulations.

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