I have always wanted to grow my cocaine.

It would improve my level of confidence in the advertised assay.....
if I were to buy some powdery stuff from a dude in an alley.

Harnessing analogous genius, I would think powdered MHRB (that you did not powder yourself) would be the least desirable form of starting material when using the services of another gardener.
It seemed counter intuitive because it spares you some prep work.

SO, my question is this:
Are there any clues that your starting material is in fact inner root bark and not some combination of the two.
Are there differences in the physical and/or or property characteristics of inner versus outer bark that a novice could recognize to ensure he didn't get a outer as a cut with the inner he bought. (sorry for the grammar) AFTER it has been powdered.
I think I would score high on the
'cynicism and lack of confidence in people test'.
I say this because I did search and was really surprised when I did not get a deluge of results.
Perhaps its just really f*T%g obvious and I cant see it.
(probably, don't buy the powder you moron)

This much you intuit correctly:
No discussion on selling, buying, sourcing, acquiring, pricing, trading, receiving, distributing, mentioning pending deliveries or smuggling of drugs
Only talk about sources for live plants and seeds
It would be good if you cleaned up your post by removing/rephrasing the references to buying.