When a certificate may be issued
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
A certificate showing the results of any analysis, classification, or grading shall be issued on any naval stores which conform with a United States Standard as to kind and grade and which have been sampled by or under the direction and supervision of an official inspector in accordance with the provisions in this part. The certificate shall be valid only so long as the naval stores described therein shall remain under seal or in the identical condition obtaining at the time of their examination.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.