§ 304-4.1 Alternative authorities for accepting non-Federal source travel expense payments.
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
Agencies may accept payment for travel expenses to events other than meetings from a non-Federal source pursuant to an agency gift statute or similar statutory authority. However, this part is the only authority agencies may use to accept (or authorize an employee to accept on the agency's behalf) payment for travel expenses from a non-Federal source to attend a meeting.
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.