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(b) “Extra-terrestrially exposed” means the state of condition of any person, property, animal or other form of life or matter whatever, who or which has: (1) Touched directly or come within the atmospheric envelope or any other celestial body; or (2) Touched directly or been in close proximity to (or been exposed indirectly to) any person, property, animal or other form of life or matter who or which has been extra-terrestrially exposed
The law was passed originally to protect Earth from possible biological contamination resulting from the US Apollo Space Program and other space exploration programs. It has been suggested by researchers and scientists that the U.S. government was very concerned that contact with extra-terrestrial bacteria could result in a worldwide plague. The immune system of human beings wouldn't be able to fight off extra-terrestrial bacteria, so therefore any kind of "extra-terrestrial exposure" was taken very seriously.