Every serious seller tells you to ask for the lab report. Almost nobody explains what to do with it once it lands in your inbox. So the report gets a two-second glance, the buyer checks that the big number is high, and the four sections that actually protect them go unread.
A certificate of analysis — a COA — is a third-party lab’s record of what a batch contains. On infused flower it matters more than it does on raw bud, because there is a second ingredient involved and a second set of ways things can go wrong. Here is how to read one properly.
The headline number is the least useful thing on the page
The figure printed biggest is usually raw THCA. On its own it tells you very little, because THCA is not what gets you high. It is the acidic precursor sitting in the plant, and it only becomes active THC when heat drives off a carbon dioxide group — the reaction called decarboxylation, which happens when you light it.
That conversion loses mass, so the active number is always lower than the raw one. Labs account for it with a standard calculation:
Total THC = (THCA × 0.877) + THC
The 0.877 is simply the ratio of the two molecular weights — roughly 314 over 358. Worked through: a batch testing 60% THCA with 1.5% existing THC gives 60 × 0.877 = 52.6, plus 1.5, for about 54.1% total THC.
Two things follow. First, if a listing advertises 60% and the COA says 60% THCA, the honest active figure is nearer 54%. Second, that 54% is a ceiling rather than a promise, because it assumes every molecule converts. Real-world decarboxylation depends on how hot you burn and how you inhale, so you will never extract the theoretical maximum.
A related trick to watch for: some sellers publish “max THC”, which is raw THCA plus raw THC added together with no conversion applied at all. That number is meaningless and always flattering. If a figure looks implausibly high for the format, this is usually why.
The four sections that actually matter
Potency is the part everyone reads. Safety is the part worth reading.
Pesticides. This is the most common reason a batch fails testing. Panel sizes vary enormously — a lab screening two hundred compounds gives you far more assurance than one screening fifty, and a short panel passing cleanly is weaker evidence than it appears. Check how many analytes were run, not just that the column says pass.
Heavy metals. Labs typically screen lead, arsenic, cadmium and mercury. Cannabis is a hyperaccumulator, meaning it draws metals out of its growing medium efficiently, so this section is not a formality. You want ND — none detected — or a clear pass against a stated limit in parts per million.
Residual solvents. On infused flower this is the section most people skip and the one most worth their attention. Raw flower has no solvents to test for. Coated flower does, because something was extracted to make the coating. If a product was built with butane, propane or ethanol extract, those solvents have to be purged below safe thresholds, and the panel is how you confirm it happened.
This is also where solventless products separate themselves. Persy Snow Balls are made with ice-water hash, where the only inputs are water, ice and pressure, so there is no solvent question to answer. Our Snow Caps Weed Ice Capz use the same mechanical process for their caps. Products built on distillate or isolate do have a solvent history, and the panel is how you check it was handled properly.
Microbials. Mould, yeast, E. coli and salmonella. Relevant for anything stored in volume or shipped in humid conditions, which covers most of what moves online.
Three details that separate a real COA from a decorative one
Match the batch number. The number on the report has to match the number on the bag. A COA for a different batch is not evidence about the product in your hand, and this is the single most common way a legitimate-looking report turns out to be irrelevant. One brand, one lab, one logo, wrong batch — it happens constantly.
Check the lab is accredited. ISO 17025 is the standard to look for, and the accreditation needs to cover the specific tests on the report. An accredited lab that is only accredited for potency is not an authority on pesticides.
Treat “not tested” as a result. A blank cell or a “not tested” entry in a safety panel is information, not an oversight. Full panels are routine for anyone operating properly. If three sections are populated and the fourth is empty, ask why before buying.
Red flags worth walking away from
A COA sent as a cropped screenshot rather than a full PDF. A report with the lab’s name removed. Potency figures that appear on the listing but nowhere on the document. A seller who offers a report for “the same product” from a different batch. And any number above roughly 90% total THC on something described as flower — at that point you are no longer looking at flower, whatever the label says.
If you want to sanity-check a lab itself, searching the lab name on Google and then on Bing is worth the thirty seconds. The two surface different regulatory notices and industry coverage, and labs that have been sanctioned for inflating potency tend to show up in one index before the other.
Why this matters more on coated flower
With ordinary bud, what you see is what you are buying. With snow cone weed and other coated formats there are two ingredients, two supply chains and two chances for something to go wrong. The flower might be clean while the concentrate is not. The coating might be isolate from a source nobody can name.
That is also why the same scrutiny applies across infused categories generally — the questions you would ask about a cart’s extract are the questions to ask about a coating. This explainer on live resin, live rosin and distillate covers how much the extract type changes what you end up inhaling.
We publish batch reports on request for everything on the menu. If you are looking at a specific batch of KAWS Rocks Snow Caps Edition or anything else listed at snowcapweed.com, ask before you order rather than after.
For adults 21 and over where legal. Nothing here is medical advice, and no statement here has been evaluated by the FDA.