Illinois Methamphetamine Precursor Control Act
The Methamphetamine Precursor Control Act (MPCA, 720 ILCS 648) is an Illinois state law that was signed into law on November 16, 2005, and took effect on January 15, 2006. The MPCA is an act used to create significant barriers such as the requirement to present ID to purchase cold medication that contains pseudoephedrine (Sudafed, Tylenol Cold and Claritin D) which could be used to produce methamphetamine.
Source: Wikipedia — Illinois Methamphetamine Precursor Control Act (CC BY-SA 4.0)