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COA explainer · United States

Connecticut: from grower to shelf, what ends up on the label

Play it: the batch moves through the Department of Consumer Protection's workflow on the left, and each required label piece snaps onto the package on the right, color-coded by who adds it. The lab samples the product already sealed in its final package.

Sample data · Connecticut (DCP, CGS chapter 420h, Policies and Procedures 21a-421j) · for illustration

🏷️ The product label, building live

Thimble Haze · Shoreline Flower
Raw cannabis (flower)
Fictional sample label for illustration, not a compliant, printable label.
🌱 Cultivator adds it📦 Packager adds it🔬 Lab / COA adds it🏪 Retailer adds it🏛️ DCP (always required)
The big idea: Connecticut tests the product the way you will buy it. Since January 2025 the whole batch must already sit in its final packaging when the lab employee arrives to pick samples at random, so nothing can change between the test and the shelf. The rules also set a ceiling (adult-use flower over 30% total THC fails), tie every product name to a registered lab profile that must hold within 90% to 110%, and specify the label down to the font: black Times New Roman, a red-boxed warning and two state graphics, a red-outlined CONTAINS THC triangle and a red 21+ circle. And any buyer can ask to see the certificate of analysis.

Sample label for illustration, not a compliant, printable label. Connecticut rules (Department of Consumer Protection, CGS chapter 420h, adult-use Policies and Procedures 21a-421j-1 to 39, effective 12 November 2024), read October 2026. Educational, not legal advice.

Step by step: Connecticut

  1. Step 1: Cultivator / harvest batch (Cultivator) A licensed cultivator, producer or micro-cultivator harvests a batch: one genotype, harvested within 72 hours and cured together, at most 40 lb for testing. Every plant and package is logged under a unique identifier in CATS, Connecticut's seed-to-sale system. This is where the cultivated-by line and the net weight come from.
  2. Step 2: Into final packaging first (Packager) Since 1 January 2025 the batch must be homogenized, inspected for foreign matter and placed in its final packaging before the lab arrives, so the sample is the product exactly as it will be sold. Products are capped at 40,000 units per batch.
  3. Step 3: The lab picks the sample (Lab) A testing laboratory employee selects samples at random from the packaged batch: at least 0.4% of the batch and never under 20 g of raw cannabis, or 2 to 32 packaged units for products depending on batch size. Lab staff may enter the restricted area only to identify and collect samples. The rest of the batch is isolated and may not move.
  4. Step 4: Lab analysis (Lab) An in-state, DCP-licensed lab working to ISO/IEC 17025 runs microbials (by qPCR, with four Aspergillus species screened on inhalables), five mycotoxins, five heavy metals, 66 pesticides (21 must not be detected at all), water activity, solvents for extracts, a vape-additive screen (no vitamin E acetate, PEG, MCT oil or squalene) and the full cannabinoid and terpene profile.
  5. Step 5: COA into CATS + the THC ceiling (Lab) The lab enters every result in CATS and issues the certificate of analysis; until then nothing may be sold or moved. Adult-use flower over 30% total THC on a dry-weight basis fails, as does any other product over 60% (vape cartridges aside); stronger products may go only to patients. The lab keeps 25% of the sample for 60 days for state testing, and a COA is valid for one year at most.
  6. Step 6: DCP registration (DCP) The Department of Consumer Protection registers every product name against a COA no more than 30 days old, and a product may carry that name only while its tested profile stays within 90% to 110% of the registration. The first batch in each category is stability-tested in its final package at 30 and 60 days. A failed batch follows the retest and remediation rules of Public Act 24-76.
  7. Step 7: Package + label (Packager) The package is one solid color, opaque, child-resistant and tamper-evident. The label is printed in black Times New Roman at least 1/10 inch tall: CATS ID, registered name, grower, expiration, net weight in metric and imperial units, directions and onset time, each active ingredient over 1%, allergens, a red-boxed warning plus a rotating one, and two DCP graphics: the red-outlined CONTAINS THC triangle and the red 21+ circle.
  8. Step 8: Retail sale (Retailer) A retailer or hybrid retailer sells to adults 21+, at most one ounce per package; edibles are capped at 5 mg THC per serving and 100 mg per package. An insert, extended label or static QR code carries the full profile and test results, and the COA must be available on request to any buyer.

Frequently asked questions

Who tests cannabis in Connecticut?
An in-state cannabis testing laboratory licensed by the Department of Consumer Protection and working to ISO/IEC 17025 tests every batch before it can reach a store. It runs microbials, mycotoxins, five heavy metals, 66 pesticides, water activity, solvents for extracts and a vape-additive screen, enters the results in the state's CATS system and issues the certificate of analysis.
Who pulls the sample in Connecticut?
A testing laboratory employee does. Since January 2025 the business must first homogenize the batch, inspect it for foreign matter and place all of it in final packaging; the lab employee then picks samples at random, at least 0.4 percent of the batch and never under 20 grams of flower. The rest of the batch stays isolated until the certificate arrives.
What has to be on a cannabis label in Connecticut?
A Connecticut label carries the CATS unique identifier, the registered product name, the grower or manufacturer, expiration date, net weight in metric and imperial units, servings, every active ingredient over 1 percent, allergens, a red-boxed warning plus a rotating one, and two state graphics: a red-outlined CONTAINS THC triangle and a red 21+ circle, all in black Times New Roman.
Can I get the lab report for cannabis I buy in Connecticut?
Yes. Connecticut's adult-use Policies and Procedures say certificates of analysis must be available on request to any person purchasing cannabis, and to physicians, physician assistants and APRNs. Each package must also carry, through an extended label, an insert or a static QR code, the full cannabinoid and terpene profile and the date and result of the contaminant testing.
Is there a THC limit on cannabis in Connecticut?
Yes, for adult-use products. A flower or trim sample with more than 30 percent total THC on a dry-weight basis fails testing, as does any other product above 60 percent except prefilled vape cartridges. Edibles are capped at 5 milligrams of THC per serving and 100 milligrams per package. Stronger products may be sold only to registered patients as medical marijuana products.

Keep reading

Educational information only, not medical advice. Terpene and cannabinoid effects are an active area of research and vary by person, product, and dose. Cannabis is for adults 21+ where legal.

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