The short answer
Safety depends on two things: who sells the product, and where you live. A licensed dispensary in a state with legal medical or adult-use sales has a state license number, tested products, and a physical address. An unlicensed site has none of those. Federal law still lists cannabis as a controlled substance, so shipping marijuana across state lines is not legal, even when both states allow sales.
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Federal status and state status
Cannabis sits in Schedule I of the Controlled Substances Act. Federal agencies can act against sellers in states with legal markets. As of 2024, 24 states and the District of Columbia allow adult-use sales, and 38 states allow medical cannabis. Each state runs its own licensing system, testing rules, purchase limits, and tax rates.
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The state line matters. A dispensary that ships to another state puts the buyer in a gray zone with no product recourse and no legal protection.
How to check a seller before you pay
- Find the license number on the site. Match it against the state regulator's public license list. If the number fails the lookup, stop.
- Confirm the site lists a physical address in the same state as your delivery address.
- Look for a lab test panel that covers potency, pesticides, heavy metals, mold, and residual solvents.
- Check the package details: batch number, harvest date, THC percentage, CBD percentage.
- Confirm the age gate and the ID check at delivery. Legal sales require age 21 for adult use in most states.
Payment red flags
Card networks restrict cannabis transactions. A site that demands gift cards, wire transfers, or crypto with no refund path gives you no chargeback. Licensed shops post menus with item prices and taxes at checkout. Unlicensed sites push countdown timers and bulk discounts.
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The hemp-derived THC market
The 2018 Farm Bill defined hemp as cannabis with 0.3% or less delta-9 THC by dry weight, and that definition is federal. Sellers use the gap to ship delta-8, delta-10, and THCA products by mail. State rules for those products differ, and several states have banned delta-8 sales. The FDA has not approved these products for any use and has sent warning letters to sellers. Potency per package can run well above a standard dose, and labels do not always match lab content.
Pitfalls to avoid
- No license number, or a number that fails the state lookup.
- No lab results, or results that do not match the batch on the package.
- Payment by gift card or peer-to-peer app with no receipt.
- Any offer to ship flower or edibles across state lines.
- Edibles with a total package dose above the state limit. Many states cap a package at 100 mg THC and a single serving at 10 mg.
- Prices far below local dispensary rates. Testing and licensing cost money.
Parameters that decide the purchase
Compare price per milligram of THC, not price per package. Check the state purchase limit, which is often 1 ounce of flower for adult use. Check delivery fees and the minimum order. Check the return policy for damaged or mislabeled items. A licensed seller states all four in writing before checkout.
If a site cannot answer where its license is, who tested the batch, and how it takes payment, the answer to the safety question is no.