Question: Border Patrol Agent Cesar Cantu boarded a bus in Texas to check the immigration status of its passengers. As he walked off the bus, he squeezed the soft luggage that passengers had placed in the storage racks above their seats. After squeezing a green canvas bag belonging to Steven DeWayne Bond, Cantu concluded that it contained a "brick-like" object. Bond allowed Cantu to open the bag. Upon doing so, Cantu found a "brick" of methamphetamine, which had been wrapped in duct tape and then rolled in a pair of pants. Did Cantu's physical manipulation of Bond's luggage constitute an "unreasonable search and seizure" for purposes of the Fourth Amendment?