Maybe my search failed but I didn't see a post up for this so I figured I would put one up for everyone.
Source: http://www.aopa.org/tsa_rule/
Protect yourselves and enjoy!
Logbook or Record-keeping Requirements. An instructor must keep a copy of the documents for five years that are used to prove citizenship or make an endorsement in both the instructor's logbook, or other record used by the instructor to record flight student endorsements, and the student's logbook with the following:
"I certify that [insert student's name] has presented me a [insert type of document presented, such as a U.S. birth certificate or U.S. passport, and the relevant control or sequential number on the document, if any] establishing that [he or she] is a U.S. citizen or national in accordance with 49 CFR 1552.3(h). [Insert date and instructor's signature and CFI number.]"
Source: http://www.aopa.org/tsa_rule/
Protect yourselves and enjoy!