Everything I have seen would confirm that, but the good news is they don't live very long once their teeth start to disintegrate from the battery acid they use to extract the pseudophedrine.
Anybody who would knowingly ingest anything manufactured with battery acid deserves whatever they get.
It's an addiction. The chemicals re-wire their brains in ways that it's not possible for someone on the outside to understand. During the crack days of the early 90s addicts (both male and female) would trade their children for the drug.
I have no expertise or knowledege of this subject, even though last week I did stay at a Holiday Inn Express..but one thing makes me question the premise of the article. If, as is stated, the Mexican cartels control 90+% of the meth production, it seems to me it would be far easier, cheaper, and safer ( from from law enforcement) to manufacture it in Mexico and smuggle the finished product into the US