When the Founders gave Congress the power to “establish Post Offices,” they didn’t mean for those offices to become Constitution-free zones. The Fourth Amendment’s protection against unreasonable searches and seizures means that postal officials, like all government agents, need facts suggesting that our mail contains illegal or dangerous items before they can snatch it. But IJ client René Quiñonez came to learn how easily postal officials can violate our right to privacy in our mail—and how hard it is to seek accountability when they do.