I think everyone is misunderstanding
@rpbb.
Sources should test theirs raws for several reasons.
First reason it to ensure the raws are what the manufacturer or distributor claim. I sure know I don’t want fentynl in my bottle on accident.
Second is to ensure the brewing recipe is correct. Many sources over dose gear by x% to be on the safe side. But... the money they save by not having to guess on the recipe would pay for the testing to ensure everyone is safe and the product is as labeled.
One of the better labs potg used to test all his raws and post them. His gear always came back spot on with the exception of some anavar or something. But he did compensate everyone who purchased that product for the error.