How long must a school maintain records?
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
The responsible administrative official for each school must maintain records relating to ISEP, supplemental services, and transportation-related expenditures. The official must maintain these records in appropriate retrievable storage for at least the four years prior to the current school year, unless Federal records retention schedules require a longer period.
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.