Most of the methamphetamine consumed in the u. s. had its origin in:

Much of the methamphetamine consumed in the US is manufactured domestically by amateur chemists in meth labs from common household drugs and chemicals such as lye, lithium, and ammonia. Since the passage of the Combat Methamphetamine Epidemic Act of 2005, the Drug Enforcement Administration has reported a sharp decline in domestic meth lab seizures, but drug cartels continue to meet demand by manufacturing meth in Mexico and smuggling it across the border