Which of the court cases significantly modified the bright-line rule?

Question

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Arizona v. Gant significantly modified the bright-line rule regarding searches of vehicles incident to a lawful arrest, limiting such searches to cases where the arrestee is unsecured and within reaching distance of the passenger compartment at the time of the search or when it is reasonable to believe evidence relevant to the crime of arrest might be found in the vehicle.

Which of the Court Cases Significantly Modified the Bright-Line Rule