Romney's claim he "got tough" on methamphetamine dealers is questionable since a proposal to stiffen sentences never passed the Massachusetts Legislature.

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Nakoula has reportedly previously been arrested for trying to make methamphetamine.

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Research carried out in Torrance, California, and reported in the journal "Neurology", compared the brains of 26 previous methamphetamine users with 24 non-users.

BBC: Amphetamine brain damage measured

An FBI indictment in November 2012 charged 34 ABT members with three murders, several attempted murders, assault, kidnapping and conspiracy to distribute methamphetamine and cocaine.

BBC: News Magazine, Washington DC

According to the United States' Drug Enforcement Administration, the average price of methamphetamine jumped 73% between January and September last year (the most recent figures available).

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The Palantine, Illinois-based company, Acura Pharmaceuticals, today launched a new nasal decongestant product formulated to prevent its use in the illicit synthesis of methamphetamine.

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Yokukansan inhibits social isolation-induced aggression and methamphetamine-induced hyperlocomotion in rodents.

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This often cumbersome and time-consuming process for consumers and pharmacy staff alike has been intended to stunt the explosion in clandestine methamphetamine labs, particularly in rural areas where law enforcement is spread thin.

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Last year, Almonte testified that a Santa Muerte statue prayer card, found with a kilogram of methamphetamine in a couple's car in New Mexico, were "tools of the trade" for drug traffickers to protect them from law enforcement.

WSJ: Underworld saint becoming more popular in US