An informant told police a known drug dealer was going to sell cocaine at a specific location. Investigators set up surveillance and watched the drug dealer meet with the informant and exchange duffle bags. The informant signaled the police who detained the drug dealer as he drove away. Police searched the duffle bag in the drug dealer's car and seized the contents. Discuss whether the search of the duffle bag was lawful. [California v. Acevedo, 500 U.S. 565 (1991)].