by a police officer from a lawful vantage point; Probation search: A person on probation may be required to consent to searches of their person, property and home as a condition of probation; Safety checks: Entry is made into premises to ensure that people inside are not in danger or in need of medical assistance, with evidence of criminal activity observed incidentally to the safety check; and Search incident to arrest: A suspect and the suspect's immediate surroundings are searched at the time the suspect is arrested. See also NSA warrantless surveillance controversy Signing statement Imperial Presidency ECHELON Information Awareness Office Foreign Intelligence Surveillance Act Unitary executive theory Cabinet noir Executive Order 2604 – Woodrow Wilson (text) Executive Order 12036 – Jimmy Carter (text) Executive Order 12139 – Jimmy Carter (text) Executive Order 12949 – Bill Clinton (text) Minimally-intrusive warrantless search United States v. Davis (2014) References United States national security policy Privacy of telecommunications Privacy law in the United States