In the case of United States v. Guana-Sanchez in 1974, the defendant, a Mexican national named Guana-Sanchez was accused of illegally entering and residing in the United States. He had been previously deported from the U.S., but re-entered without obtaining permission from immigration authorities as required by law. The defense argued that his previous deportation order was invalid because he did not have legal representation during those proceedings, thus violating his Fifth Amendment rights to due process. However, the Supreme Court ruled against him stating that while aliens are entitled to constitutional protections when they are physically present in America, these protections do not extend to situations outside American borders such as exclusion or expulsion proceedings conducted abroad or at border entry points before an alien has entered into any part of this country.

The dissenting opinion in the United States v. Guana-Sanchez case argued that the majority's decision to uphold a warrantless search of an automobile was inconsistent with previous Supreme Court rulings on Fourth Amendment rights. The dissenters believed that there were no exigent circumstances justifying a departure from standard procedure, which requires law enforcement officers to obtain a warrant before conducting a search. They contended that this ruling could potentially open the door for more widespread violations of citizens' privacy rights by police officers under the guise of routine traffic stops or other minor infractions. Furthermore, they expressed concern about potential racial profiling and discrimination resulting from this decision, as it gives law enforcement broad discretion to decide when and where to conduct these types of searches without any judicial oversight.