We have been through fair share of raws bags and unfortunately, you will very often encounter stuff you would never expect of something that is supposed to be a pharmaceutical substance. Various unidentified particles, hair etc. Do not even dare to try calling raws sterile please.
Do not get me wrong, I love China, we all love China, they can do very well, we have been cooperating with China on various projects outside pharmaceuticals too, but to get desired results, they need hard supervising even on projects that are official, considered GMP etc. Therefore you can not expect raws that are sold under the counter, basically uncontrolled to be any close to sterile. That is why it is of paramount importance to do the homework on processing them carefully into final product.
Raws are raws, you can process them at home yourself and brew on your own into something useable, but nowadays many people also buy finished, cheap product from China and use directly. Pills...okay...we eat them and the digesting system can get along with whatever, but oils get injected directly into body to be freely absorbed with whatever is inside. Take the money saved and buy some syringe filters at least and filter the gear before you inject into your body.