Arizona Gov. Jan Brewer has signed into law a contentious immigration measure that gives police sweeping powers to question and arrest illegal immigrants. The law has aroused strong emotions from supporters and detractors, some of whom fear the bill will scare away business.

The law, known as Senate Bill 1070, allows police to arrest illegal immigrants for trespassing in Arizona, requires immigrants to carry work and travel papers, and makes it a crime to transport illegal immigrants, including day laborers.

Brewer, who is running for re-election, faced political pressure from both sides on this issue.

Public opinion polls show the majority of Arizona voters back the measure, with strong support from conservatives including Maricopa County Sheriff Joe Arpaio, who also is mulling a gubernatorial run. U.S. Senator John McCain, an Arizona Republican, also expressed support for the bill.

Critics include those in the tourism industry, who are concerned that the law underscores a negative image of Arizona and could cost the state conventions and other major events. A number of religious groups have opposed the bill, and President Obama has spoken out against it.

Phoenix Mayor Phil Gordon and others say the measure is anti-Latino and will lead to unfair targeting of those with brown skin.

Immigration has been getting more attention due to a rise of drug-related crimes and murder of an Arizona rancher. An illegal immigrant is suspected in the death.