The history of meth is an odd mosaic of chemists, World War II fighter pilots, long-haul truckers, college students on all-night crams, Hell’s Angels and Mexican cartels. . 2013.
Chemical diagram of phenylacetone (from Phenylacetone - Wikipedia).
This method yields lower quality dl-methamphetamine, has been associated with outlaw motorcycle gangs (OMGs), and is commonly referred to as the P2P method.