The U.S. Department of Justice wants new authority to hack and search remote computers during investigations, saying the new rules are needed because of complex criminal schemes sometimes using millions of machines spread across the country. Digital rights groups say the request from the DOJ for authority to search computers outside the district where an investigation is based raises concerns about Internet security and Fourth Amendment protections against unreasonable searches and seizures. “By expanding federal law enforcement’s power to secretly exploit ‘zero-day’ vulnerabilities in software and Internet platforms, the proposal threatens to weaken Internet security for all of us,” Nathan...