  As far as the manufacturing of L-methamphetamine into D-methamphetamine goes, I don't believe this to be a practical method of producing street-grade methamphetamine.. The chemistry involved is unnecessarily overly complexed in that it would take far more effect to get the molecule to flip than it would to make meth via the traditional method.. Im not saying that it can't be done however I dont believe it should be included in the wiki-article..   Weebl8bob