In Muncie Aviation Corp. v. Party Doll Fleet, Inc. the United States Court of Appeals for the Fifth Circuit held that advisory materials promulgated by a federal agency, but not having the force and effect of law, are admissible as an exception to the hearsay rule when such materials are relevant, necessary as a matter of practical convenience, and otherwise trustworthy.
Rowe, Walter Prince
"Evidence--Government Advisory Materials Exception to Hearsay Rule,"
Mercer Law Review: Vol. 27:
4, Article 19.
Available at: https://digitalcommons.law.mercer.edu/jour_mlr/vol27/iss4/19