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


### Answer
The term **destructive substance** is defined in *18 U.S.C. § 1993* as follows -

> given to that term in section 31 of this title;

#### Citation:
  - *18 U.S.C. § 1993*
  - Heading: **PART I-CRIMES > CHAPTER 97-RAILROADS**

