Aging with rare woods

A while back I got into the idea of using non-standard, or even rare, woods to age/mature whiskey. The foray that put a pause on that was pawpaw wood, which has acetogens and can be pretty doggone deadly. 

I want to try acacia confusa wood (because, ya know, fun to try) but my big question is how would I go about finding if it's safe to use and how to get it?

Thanks in advance yall