Earlier quoted context omitted.
Meth is not harder to produce. It's now mass-produced from P2P, with chiral purification using various methods (like pulling one enantiomer with tartaric acid).
I'm curious about the chemistry here (though I have very little chemistry background), so, bearing in mind that I have zero interest in producing methamphetamine, perhaps you can elaborate a little: – I can't see how Phenylacetone can have chirality – I don't understand how any enantiomer of P2P (if one exists, see above) can be selected for specifically via a chemical reaction, especially here with tartaric acid, wh…
> – I don't understand how any enantiomer of P2P (if one exists, see above) can be selected for specifically via a chemical reaction
You just react P2P and get a racemic mix of L- and D- enantiomers of meth. Then you react it with tartaric acid, which will preferentially react with the "right" meth.
> tartaric acid, which is a chiral molecule itself
Ah, I see the confusion. Tartaric acid derived from biological sources consists of just one enantiomer, that's why you can use it to do chiral resolution.