I'm pretty sure she was thinking of lithium grease when she checked Rockin's i.d.
(altho some of the other comments could have merit too..
)
Methamphetamine is so addictive that it's become a scourge to our whole country. It costs $10,000 a day to treat one of those idiots that blow up their meth lab and get taken to the burn center at Vanderbilt Hospital, and guess who pays THAT bill....