Arizona officers getting last-minute training on immigration law

he said. "If theres a new law out, were going to enforce it."

He said that the space he made in the complex of military surplus tents can handle 100 people, and that he will find room for more if necessary.

Elsewhere in the state, police officials said they didnt expect any dramatic events. They were busy wrapping up training sessions this week, with some agencies saying that untrained officers will not be allowed on the streets.

Many of the states 15,000 police officers have been watching a DVD released this month showing signs that might indicate a person is an illegal immigrant -- speaking poor English, looking nervous or traveling in an overcrowded vehicle. It warned that race and ethnicity do not.

Some agencies added extra materials, including a test, a role-playing exercise or a question-and-answer session with prosecutors.

Critics of the law among police chiefs remain, saying that the law is so vague that no amount of training could eliminate potential confusion.

"Am I going to sit here and say I think every officer has a clear understanding of the law when they leave the training?" Tucson Police Chief Roberto Villasenor said. "No, because I think the law is poorly constructed."

Virginia Kice, a spokeswoman for U.S. Immigration and Customs Enforcement, declined to comment on preparations or the role federal authorities would play in enforcing the law, except to say ICE "focuses first on criminal aliens who pose a threat to our communities."