New Rule on Endangered Species Act: New science cannot be applied to old case

WASHINGTON, May 23 - The southwestern regional director of the United States Fish and Wildlife Service has instructed members of his staff to limit their use of the latest scientific studies on the genetics of endangered plants and animals when deciding how best to preserve and recover them.

Dale Hall, the director of the southwestern region, in a memorandum dated Jan. 27, said that all decisions about how to return a species to robust viability must use only the genetic science in place at the time it was put on the endangered species list - in some cases the 1970's or earlier - even if there have been scientific advances in understanding the genetic makeup of a species and its subgroups in the ensuing years.

Read the rest of the article, by Felicity Barringer, in The New York Times.