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


### Answer
The term **controlled substance** is defined in *41 U.S.C. § 706* as follows -

> a controlled substance in schedules I through V of section 812 of title 21

#### Citation:
  - *41 U.S.C. § 706*
  - Heading: **CHAPTER 10-DRUG-FREE WORKPLACE**

