### Question
How does the law define valid prescription?


### Answer
Under *21 U.S.C. § 830*, **valid prescription** is defined as:

> a prescription which is issued for a legitimate medical purpose by an individual practitioner licensed by law to administer and prescribe the drugs concerned and acting in the usual course of the practitioner's professional practice

#### Citation:
  - *21 U.S.C. § 830*
  - Heading: **CHAPTER 13-DRUG ABUSE PREVENTION AND CONTROL > SUBCHAPTER I-CONTROL AND ENFORCEMENT > Part C-Registration of Manufacturers, Distributors, and Dispensers of Controlled Substances**

