I get the logic behind it.
But just like buying from a new source, you check a bottle in the first batch you buy, but nobody checks every bottle they use.
I would think if he brews a batch with some raws, and gets good numbers on the final product, the rest of the batches ought to be gtg. If not what he expects, then make adjustments for subsequent batches.
I'm not saying what y'all are saying isn't logical. I see what you're getting at.
I'm just not sure I'm convinced it's necessary for this application.
I personally know of licensed compounding labs that done test every batch of raws. So I'm not sure why a ugl gear source should. It doesn't seem relevant to the ultimate quality of the product.