### Question
How is the "controlled substance analogue" defined?


### Answer
The term **controlled substance analogue** is defined in *21 U.S.C. § 802* as follows -

> a substance—


(i) the chemical structure of which is substantially similar to the chemical structure of a controlled substance in schedule I or II

#### Citation:
  - *21 U.S.C. § 802*
  - Heading: **CHAPTER 13-DRUG ABUSE PREVENTION AND CONTROL > SUBCHAPTER I-CONTROL AND ENFORCEMENT > Part A-Introductory Provisions**

