I wonder if a's pentbarbital is made by a compounding pharmacy. I had an article I had posted on another thread talking about where it is made which I will find and post if I have time.
four drug companies have U.S. Food and Drug Administration approval to make a pentobarbital drug for human use: Akorn Inc, which sells it under the trade name Nembutal, and three generic manufacturers: Sagent Pharmaceuticals Inc, Custopharm Inc, and Renaissance Pharma Inc. But all four makers have anti-capital punishment policies and refuse to sell the drug to U.S. prisons and the Justice Department.
The same article lists drug testing labs in the U.S.