Racemisation of l-methamphetamine

[ex-amine]

Great find.

So according to that publication it turns out they're doing a radical mediated racemization, probably from the method described in this article: https://pubs.acs.org/doi/10.1021/jo061033l

So it seems like they don't need to use a transition metal catalyst in this case.

AIBN (from the artikle) isn't a transition metal but close, also expensive and explosive.