That's over 8 ounces! You are very, very generous. lol
The average weight in grams for testing cannabinoids in flower is VERY low. A very rough ballpark is around 3 grams (and some labs require less, I have seen up to 1.5 grams for a cannabinoid test.) Full panel pathogen testing can be done with a couple of grams.
Commercial grows send larger samples to labs because they are testing for BATCHES, but even then the numbers are extremely low. A 4 gram sample weight can dictate the numbers for <10 pounds in Colorado. That should instantly tell you why "high THC" and "high terpene" testing is important marketing, because those are the numbers that dictate what shelf your flower sits on (and what price it fetches wholesale and what price it fetches retail.)
Here is Nordic Analytical in Pueblo, Colorado, this is the lab that most farms in that area do their testing with. You could do full panel testing, cannabinoids, and terpenes with about 10 grams.
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That leaves a lot of flower on the table for... who? Exactly? Someone is enjoying the shit out of your smoke.
Not even a presumption, happens all day every day. There are regulatory guidelines for how to choose samples, but there is no real oversight into how you actually do it. And labs don't give a shit, they will take your money all day whether you cherry picked or doctored a sample.
Not to pick on the American Autoflower Cup (but I'm going to,) they are pulling in random growers from all over the country (but it's not a very big event, and I believe they consider it a private one. We can pretend it's not happening, but laws are quite likely being broken for these growers to mail, travel with, or otherwise cross so many state lines with what is otherwise illegal contraband. I don't think many cups would have taken place if everyone was 110% about the law, and I can just about guarantee that these cups have a "you can mail us your shit, but don't tell anyone and we won't publicly advertise this as an option" option (wink wink.)
What is your definition of a seed selling company? I mean AFN has been home to many growers-turned-breeders, and I've seen better reviews on some of our "small time, indie" breeders than I have with some of the larger companies that have represented here in the past. Would you consider Gnome Automatics small time? I've seen entire farms with Dan's genetics on them, his autoflowers sold as flower in dispensaries, and concentrates made from his flower sold in dispensaries. But he doesn't breed on a large outfit or a farm?