High school teacher selling meth to save his sick wife doesn't sound like an interesting setup. Things like this are bound to happen in a society without universal health care.
I also fail to see the moral dilemma as I am a hardcore liberal in the case of drugs. People wanna get hammered, their choice.
So yeah, selling meth to save your wife is actually the very opposite of turning bad. Aside from shooting all the right-wingers who basically kill your wife it is the only proper ethical thing to do. I am not a big fan of such pseudodilemmas.