For some Americans, practicing their religion requires a federal permit and a long wait for a controlled substance — eagle parts.

The National Eagle Repository, Building 128 at the Rocky Mountain Arsenal, is a one-of-a-kind religious-supply house that processes about 2,000 dead golden and bald eagles a year for American Indian rituals.

Under the Bald and Golden Eagle Protection Act of 1940 and amendments, an eagle may not be taken or killed — not even a loose feather may be picked up. Only dead eagles can be salvaged — and only by the federal government.

The bald and golden eagles at the northeast Denver repository have been found dead in the wild, or they come from zoos or licensed rehabilitators.