Waterfowl hunters in Missouri have used nontoxic shot since 1991.
These shot types have been approved as nontoxic by the U.S. Fish and Wildlife Service (as of January 2014):
Use or possession of lead shot is prohibited for hunting on the Conservation Areas listed below. These are larger wetlands where waterfowl and shorebirds concentrate in the fall and spring.
The nontoxic shot regulation reduces incidence of lead shot ingestion, which is often fatal to all vertebrates, waterfowl, doves, and scavenging birds, like eagles, which feed on waterfowl with lead shot in the carcass. Mounting evidence points to lead poisoning occurring in more than 134 species, including amphibians, reptiles, birds, and mammals.