The U.S. Federal Bureau of Prisons form BP-A0291 (Furlough Application – Approval and Record) contains the following:
It has been determined that consumption of poppy seeds may cause a positive drug test which may result in disciplinary action. As a condition of my participation in community programs, I will not consume any poppy seeds or items containing poppy seeds.
This form can be viewed at the Federal Bureau of Prisons web site, bop DOT gov.