NEW YORK, April 29 (UPI) -- Seven in 10 U.S. adults support arresting people who can't prove they're in the United States legally, a poll about Arizona's new immigration law indicated. The Angus Reid Public Opinion poll of 1,002 American adults asked respondents if they'd want four guidelines in Arizona's immigration law enacted in their own state. The law, the nation's toughest, seeks to identify, prosecute and deport illegal immigrants and gives police broad powers to stop people on suspicion of being in the United States illegally. Seventy-one percent of poll respondents said they'd support requiring their own police to...