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Contact with Extraterrestrial Intelligence and Human Law is written by Michael Bohlander and published by BRILL. It's available with International Standard Book Number or ISBN identification 9004677704 (ISBN 10) and 9789004677708 (ISBN 13).
It is statistically unlikely that humans are the only intelligent species in the universe. Nothing about the others will be known until contact is made beyond a radio signal from space that merely tells us they existed when it was sent. That contact may occur tomorrow, in a hundred years, or never. If it does it will be a high-risk scenario for humanity. It may be peaceful or hostile. Relying on alien altruism and benign intentions is wishful thinking. We need to begin identifying as a planetary species, and develop a global consensus on how to respond in either scenario.