Harry Blackmun

“ If destroying the interior of an automobile is not unreasonable, we cannot conclude that looking inside a closed container is. In light of the minimal protection to privacy afforded by the Chadwick-Sanders rule, and our serious doubt whether that rule substantially serves privacy interests, we now hold that the Fourth Amendment does not compel separate treatment for an automobile search that extends only to a container within the vehicle.
The Chadwick-Sanders rule not only has failed to protect privacy but it has also confused courts and police officers and impeded effective law enforcement. ”

“ Until today, this Court has drawn a curious line between the search of an automobile that coincidentally turns up a container and the search of a container that coincidentally turns up in an automobile. The protections of the Fourth Amendment must not turn on such coincidences. We therefore interpret Carroll as providing one rule to govern all automobile searches. The police may search an automobile and the containers within it where they have probable cause to believe contraband or evidence is contained. ”

“ We now must decide the question deferred in Ross: whether the Fourth Amendment requires the police to obtain a warrant to open the sack in a movable vehicle simply because they lack probable cause to search the entire car. We conclude that it does not.
Dissenters in Ross asked why the suitcase in Sanders was "more private, less difficult for police to seize and store, or in any other relevant respect more properly subject to the warrant requirement, than a container that police discover in a probable-cause search of an entire automobile?" ”