The Outer Space Treaty and WMDs
Claim in the list: Under a 1967 international treaty, placing weapons of mass destruction in space is prohibited.
Verification: Confirmed for States Parties to the Outer Space Treaty. Article IV prohibits placing in Earth orbit objects carrying nuclear or other weapons of mass destruction, installing such weapons on celestial bodies, or stationing them in outer space in any other manner. It also reserves the Moon and other celestial bodies for peaceful purposes and prohibits military bases, weapons testing, and military maneuvers there. However, the treaty is not a blanket ban on all military satellites or conventional weapons in space. It applies to its States Parties.
Conclusion: The 1967 treaty prohibits States Parties from stationing weapons of mass destruction in outer space, but it does not prohibit every form of military activity in orbit.