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Preserving Freedom from Unwarranted Surveillance Act of 2012 - Prohibits a person or entity acting under the authority of (or funded in whole or in part by) the federal government from using a drone to gather evidence or other information pertaining to criminal conduct or conduct in violation of a statute or regulation except to the extent authorized in a warrant satisfying the requirements of the Fourth Amendment to the Constitution. Defines a "drone" as any powered, aerial vehicle that: (1) does not carry a human operator; (2) uses aerodynamic forces to provide vehicle lift; and (3) can fly autonomously or be piloted remotely, be expendable or recoverable, and carry a lethal or nonlethal payload. Exempts from such prohibition the use of drones to: (1) patrol national borders to prevent or deter illegal entry of any persons or illegal substances, (2) prevent imminent danger to life when drones are used by law enforcement under exigent circumstances, or (3) counter a high risk of a terrorist attack by a specific individual or organization based on credible intelligence determined by the Secretary of Homeland Security (DHS). Authorizes civil actions by aggrieved parties. Prohibits evidence obtained or collected in violation of this Act from being admissible in a criminal prosecution in any court in the United States.