For purposes of this chapter, the term “individual with a disability” does not include an individual who is currently engaging in the illegal use of drugs, when the covered entity acts on the basis of such use.

Nothing in subsection (a) shall be construed to exclude as an individual with a disability an individual who—

(1) has successfully completed a supervised drug rehabilitation program and is no longer engaging in the illegal use of drugs, or has otherwise been rehabilitated successfully and is no longer engaging in such use;

(2) is participating in a supervised rehabilitation program and is no longer engaging in such use; or

(3) is erroneously regarded as engaging in such use, but is not engaging in such use;

Notwithstanding subsection (a) and section 12211(b)(3) of this title, an individual shall not be denied health services, or services provided in connection with drug rehabilitation, on the basis of the current illegal use of drugs if the individual is otherwise entitled to such services.

The term “illegal use of drugs” means the use of drugs, the possession or distribution of which is unlawful under the Controlled Substances Act [21 U.S.C. 801 et seq.]. Such term does not include the use of a drug taken under supervision by a licensed health care professional, or other uses authorized by the Controlled Substances Act or other provisions of Federal law.

(1) In general The term “illegal use of drugs” means the use of drugs, the possession or distribution of which is unlawful under the Controlled Substances Act [21 U.S.C. 801 et seq.]. Such term does not include the use of a drug taken under supervision by a licensed health care professional, or other uses authorized by the Controlled Substances Act or other provisions of Federal law.

(2) Drugs The term “drug” means a controlled substance, as defined in schedules I through V of section 202 of the Controlled Substances Act [21 U.S.C. 812].

(Pub. L. 101–336, title V, § 511, formerly § 510, July 26, 1990, 104 Stat. 375; renumbered § 511 and amended Pub. L. 110–325, § 6(a)(2), (3), Sept. 25, 2008, 122 Stat. 3558.)