Is there any way you could point me to more information about these facilities and or the auditing process? Back in college, I was a fiend for all type of stuf

Is there any way you could point me to more information about these facilities and or the auditing process? Back in college, I was a fiend for all type of stuff that was presumably made at these facilities. I would purchase styff from american and canadian resellers who had labs in china that would synth specific drugs for them. Always wondered what the lab conditions were like, what likelihood I was supporting nefarious business practices, how likely it was that I got harmful byproducts etc.