How We Test and Choose: Our Methodology and Editorial Standards
Disclosure: we may earn a commission when you buy through links on this page, at no extra cost to you. Our picks are based on the testing protocols used by harm reduction services — never on commission rates.
Why This Page Exists
Recommendation sites earn trust exactly once. This page documents how we work — how kits get evaluated, where facts come from, how money flows, and the claims we will not make — so you can judge our recommendations on the record, not on vibes.
How We Evaluate Test Kits
Every product recommendation is scored against four criteria:
- Coverage — how many dangerous misrepresentation scenarios can this kit catch? A reagent that rules out PMA in "MDMA" outranks one that adds a marginal confirmation.
- Clarity — how readable is the result under real conditions? Fast, high-contrast color shifts and simple line-reads score above subtle gradations.
- Cost per test — the sticker price divided by realistic tests per unit. A $20 bottle with 50+ tests is 40 cents per decision.
- Shelf life and robustness — kits that survive real storage conditions rank above fragile ones.
Rankings follow the protocols used by harm reduction organizations: multi-reagent verification as the default standard, strips for trace contaminants, and community spectrometry services recommended over home kits whenever access allows — including when that means recommending a free service instead of a product we sell.
Where Our Facts Come From
Our reference points are the published protocols and color charts of the harm reduction community — organizations like DanceSafe, public drug checking programs, and public health advisories — alongside product documentation. Specific claims we cannot anchor to an established source are hedged in the text ("commonly cited," "reported by") or cut. Every guide carries a last updated date; prices are checked against the merchant at update time and can drift between updates.
Found an error? The fastest way to make this site better is to tell us — corrections ship in the next update cycle.
How the Money Works
This site is affiliate-funded: when you buy through our links to TestKitPlus, we may earn a commission at no additional cost to you. Three commitments keep that honest:
- Disclosure is up front — on every page containing affiliate links, not buried in a footer
- Rankings never consider commission — our top budget pick is a $4.40 pack of strips, and several guides recommend free community services over any purchase
- Cons are mandatory — every recommendation lists what is genuinely bad about it; a review with no cons is an advertisement
The Claims We Refuse to Make
Harm reduction content has a bright line, and we hold it:
- We will never say a test makes a drug safe — testing reduces risk; it never eliminates it
- We will never present a reagent result as definitive — home testing is presumptive by nature
- We will never claim a product detects everything — every technology on this site has documented blind spots, and our guides name them
- We do not provide medical advice — for dependence, tapering, or overdose response, we point to qualified resources on our resources page
What This Site Is — and Is Not
TestSubstances covers drug checking: analyzing substances for safety before use. We do not cover clinical or employment drug screening of people (the difference, explained), we do not sell or ship products ourselves (purchases happen at the merchant), and nothing here encourages drug use — the entire premise is that people who have already decided to use deserve accurate information.
Questions about our standards, corrections, or partnership inquiries: through the contact details in the site footer.
Frequently Asked Questions
Do you accept payment for rankings or reviews?
No. We earn standard affiliate commissions when readers buy through links, disclosed on every page — but placement in a ranking cannot be bought, and commission rates are not an input to our scoring. Several of our guides recommend free community services over any product.
Do you physically test every product?
Our evaluations combine hands-on familiarity with reagent testing, the published protocols and reference charts of harm reduction organizations, product documentation, and community-reported experience. Where a claim rests on secondhand sources rather than direct verification, we hedge it explicitly in the text.
How often is content updated?
Every guide shows its last-updated date. Prices are re-checked at each update; substance-supply information (like emerging adulterants) is updated as public health reporting evolves. Anything older than a year should be read with its date in mind.
Why do you sometimes recommend free services instead of products?
Because spectrometry run by a trained technician outperforms any home kit, and our first commitment is harm reduction. Home kits earn their place on availability — they answer the question immediately — not by being the best possible analysis.
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Last updated 2026-07-18. Prices verified against TestKitPlus at time of update and may change. Testing reduces risk — it never eliminates it.