39 USC 3404: Unsealed letters sent by blind or physically handicapped persons
Text contains those laws in effect on January 15, 2013
From Title 39-POSTAL SERVICEPART IV-MAIL MATTERCHAPTER 34-ARMED FORCES AND FREE POSTAGE
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§3404. Unsealed letters sent by blind or physically handicapped persons
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.