In which case is it stated that a search incident to arrest requires no additional justification?

The case that firmly establishes that a search incident to arrest requires no additional justification is US vs. Robinson. In this landmark decision, the Supreme Court ruled that once an individual is lawfully arrested, law enforcement officers are permitted to conduct a search of the person and the area within their immediate control without needing further justification. This ruling is based on the rationale that the government has a legitimate interest in ensuring officer safety and preserving evidence.

The significance of this case lies in its clarification of the legal framework surrounding searches conducted after an arrest, reinforcing the notion that such searches are a standard procedural element that does not require individual justification on a case-by-case basis. This means that as long as the arrest itself is lawful, the search that follows is justified, making it a critical point of reference in understanding the limits and permissions associated with police searches.