39 U.S.C. § 3404
Section 3404 · Unsealed letters sent by blind or physically handicapped persons
Amended 1 time on record
Unsealed letters sent by a blind person or a person having a physical impairment, as described in section 3403(a)(1) of this title, in raised characters or sightsaving type, or in the form of sound recordings, may be mailed free of postage.