References

USDA Animal Welfare Act Regulations And Standards, Section 3.81 (Environment Enhancement To Promote Psychological Well-Being)

From the USDA Animal Welfare Act Regulations and Standards, Section 3.81 (Environment enhancement to promote psychological well-being)-
(e) Exemptions. 

  1. The attending veterinarian may exempt an individual nonhuman primate from participation in the environment enhancement plan because of its health or condition, or in consideration of its well-being. The basis of the exemption must be recorded by the attending veterinarian for each exempted nonhuman primate. Unless the basis for the exemption is a permanent condition, the exemption must be reviewed at least every 30 days by the attending veterinarian.
  2. For a research facility, the Committee may exempt an individual nonhuman primate from participation in some or all of the otherwise required environment enhancement plans for scientific reasons set forth in the research proposal. The basis of the exemption shall be documented in the approved proposal and must be reviewed at appropriate intervals as determined by the Committee, but not less than annually.
  3. Records of any exemptions must be maintained by the dealer, exhibitor, or research facility and must be made available to USDA officials or officials of any pertinent funding Federal agency upon request.”

www.access.gpo.gov/nara/cfr/waisidx/9cfr3.html