About 300 people gathered in Frankfort Tuesday to protest an Arizona-style immigration bill making its way through the General Assembly.The legislation gives local and state police broad authority to check the immigration status of people they suspect to be in the country illegally. The bill passed the GOP-controlled Senate, but faces an uncertain future in the Democratically-led House. Senator Perry Clark of Louisville is one of the bill's leading opponents. He says the legislation is unnecessary and expensive. The Legislative Research Commission estimated the bill would cost the commonwealth $89 million a year, primarily due to increased incarceration.