25 CFR 307.4: Standards for fabrics.

No fabric may carry the Government certificate of genuineness for Navajo all-wool woven fabric unless all of the following conditions are met:

(a) The fabric is made entirely of local wool that is locally hand-spun and is entirely woven on a native Navajo loom;

(b) The fabric is made by a member of the Navajo Tribe working under conditions not resembling a workshop or factory system;

(c) The size of the fabric is indicated in the certificate;

(d) The licensee signs the certificate.