Agreed. These products are unregulated which poses issues on several fronts, public health being a biggie. I have friends that use weed and shroom products that display self testing results, and these friends haven't had any issues. Those products are purchased at higher end boutique stores and not the quickie mart. That's why I'm wondering what products are being used in the linked article, and if there's any studies cited.
That still has a paywall unfortunately. Maybe it works for others?