Amends subsection (b) to add an explicit state-law exception for marihuana: prevents PHAs or owners from establishing admission-prohibiting standards based on marihuana activities that comply with state law, and inserts cross-reference language ('Except as provided in paragraph (3) and notwithstanding').

Adds a new subsection (c) that excludes state-law-compliant marihuana activity from the definition/term used in the section, so termination of tenancy/assistance may not be based on such activity.

Inserts additional language at the end of subsection (b)(9) of 42 U.S.C. 1437a by adding text before the final period.

Makes several edits to 42 U.S.C. 1437d: (1) in subsection (l), in the last sentence after paragraph (9) it replaces the phrase 'paragraph (5)' with 'paragraph (6)'; (2) inserts additional language before the period at the end of that sentence; and (3) inserts additional language before the period at the end of subsection (t)(7)(C).

Inserts additional language into subsection (f)(5) of 42 U.S.C. 1437f by adding text before the semicolon at the end of that provision.