Waterfowl hunters in Missouri have used nontoxic shot since 1991. This requirement has been shown to reduce the incidences of lead poisoning in wildlife.
These shot types have been approved as nontoxic by the U.S. Fish and Wildlife Service (as of January 2019):
Use or possession of lead shot is prohibited for all hunting with a shotgun on the following conservation areas:
Use or possession of lead shot for hunting doves is prohibited on the following conservation areas:
Lead is poisonous to both people and wildlife. Research shows that doves, waterfowl, and many other species of birds can suffer from lead poisoning after consuming lead pellets from spent shotgun shells. Lead poisoning can be fatal to birds and other wildlife, including bald eagles that feed on waterfowl with lead shot in the carcasses.