Chief Roberto Villaseñor said officers will prepare to enforce the state's new immigration law.
He cited obstacles the department must overcome, ranging from how to transport illegal immigrants they arrest to maintaining trust with people in the community who are concerned about racial profiling.
The department also will have to train officers to enforce the law once guidelines are established by the Arizona Peace Officer Standards and Training Board, he said.
Villaseñor, who originally opposed the bill, said lack of resources won't prevent the department from enforcing the law. "Once it's passed, we're obligated to enforce it," he said.