Methamphetamine. Makes the possession of one or more chemical reagents or precursors with the intent to manufacture methamphetamine a Class C felony. Increases the penalty to a Class B felony if the person also possesses a firearm or is within 1,000 feet of a school, public park, housing complex, or youth center while committing the crime. Prohibits the possession of ephedrine, pseudoephedrine, or phenylpropanolamine with intent to manufacture methamphetamine. Establishes a rebuttable presumption that a person (with certain exceptions) who possesses more than 24 grams of ephedrine, pseudoephedrine, or phenylpropanolamine intends to manufacture methamphetamine. Prohibits the sale of chemical reagents or precursors to a methamphetamine or other controlled substance manufacturer. Makes it a Class C felony for a person to purchase or rent a laboratory location for a methamphetamine lab, or to use a vehicle to manufacture methamphetamine, and requires the person to provide restitution for the costs of cleaning up the illegal laboratory. Provides a sentence enhancement of five years if a person manufactures methamphetamine in the presence of a child.