The Justice Department promises to keep a closer eye on how its agencies are using drones from now on -- after all, they can be useful in nabbing suspects, but they can also be used as a tool to abuse power. In its new five-page policy guidance, the department has listed when its agencies can and can't use drones, with a focus on people's right to privacy. For instance, they can't be deployed to monitor activities protected by the First Amendment, such as peaceful protests. Authorities will also have to secure warrants to use the machines in places where the subject of investigation has "reasonable expectation of privacy." Obviously, the drones can only be used for authorized investigations and never for engaging in discriminatory acts.