The DEA's sampling program has been showing that seized methamphetamine has had an average purity around 97% for years (Google "National Drug Threat Assessment", for some reason Bluelight always blocks the link). If you've got solid evidence contradicting that, I would be curious to see it.
It gets cut as it trickles down through the dealer network. It's misleading to say meth is 97% pure. What crosses the border is not what people get (I assume the DEA is testing the meth they seize at the border, which is unadulterated).
It's important to distinguish what is coming from the source and what the end user is using.
opa.uahs.arizona.edu
The analysis found that the purity of all three drugs declined as distance from the border increased, though there were differences by drug type. Methamphetamine purity declined continuously with distance, with one exception: it jumped in the northeastern United States (more than 1,500 miles from the border) during 2000-2004, probably due to imports of methamphetamine from Quebec and Ontario, Canada, which began in the early 2000s.
Distance | <50 | >50-300 | >300-600 | >600-900 | >900-1200 | >1200-1500 | |
(Meth purity by distance from the Mexican border)
This is also from awhile ago and I assume it's even worse now, and the different synthesis now makes it even worse as well. My pseudo-educated guess would be that, for the average person, meth is 20-50% pure in 2022 in the US (this data is a bit dated and there is a significant downward trend in purity since early 2000's).
I've lived near the border in Arizona and other states, there is generally a big difference in quality based on location in my personal experience with meth, cocaine and heroin. My last meth experience it was so incredibly cut I went through 2 grams in in a day or two, which would have been far beyond fatal overdose if it was 97% pure.
Meth is very easy to cut and recrystallize, people mistakenly think that big crystals = more purity, which is simply untrue.
Admittedly I'm only thinking about the US it may be wildly different in other parts of the world.
anyways, sorry for going off topic on this thread, bit irrelevant