A trio of Republican state senators is pushing to bar law enforcement agencies from using remotely piloted drones in Minnesota for evidence gathering except in rare circumstances. Legislation introduced Thursday would allow people to sue if law enforcement violates the restrictions, and would prohibit evidence gained from a drone from being used in a criminal trial. The Minnesota bill is part of a crop of anti-drone measures. At least a dozen states are considering curbs on domestic use of the powered aerial vehicles that have gained popularity for their use in war zones. The bill provides exceptions for terrorism investigations, when a warrant has been obtained and when there is imminent danger to life, property or ability to apprehend a suspect.