Planetary Protection Classification of Sample Return Missions from the Martian MoonsPlanetary Protection Classification of Sample Return Missions from the Martian Moons An international consensus policy to prevent the biological cross contamination of planetary bodies exists and is maintained by the Committee on Space Research (COSPAR) of the International Council for Science, which is consultative to the United Nations Committee on the Peaceful Uses of Outer Space. Currently, COSPAR's planetary protection policy does not specify the