### Question
What is the definition of methamphetamine precursor chemicals?


### Answer
The definition of **methamphetamine precursor chemicals** is as follows in *6 U.S.C. § 220*:

> the chemicals ephedrine, pseudoephedrine, or phenylpropanolamine, including each of the salts, optical isomers, and salts of optical isomers of such chemicals

#### Citation:
  - *6 U.S.C. § 220*
  - Heading: **CHAPTER 1-HOMELAND SECURITY ORGANIZATION > SUBCHAPTER IV-BORDER, MARITIME, AND TRANSPORTATION SECURITY > Part B-U.S. Customs and Border Protection**

