Clearwater police say a 2-year-old law to cut down on false alarms from security systems is working, and they're asking the City Commission to add to the law. False alarms decreased 8 percent from 1990 to 1991, according to a report given to commissioners Monday. The ordinance applies only to security alarms, not smoke detectors or fire alarms. A person with a permit is allowed one false alarm a year. After that the person will be charged $30 _ the amount the city says it costs to answer the false alarm. Police want commissioners to require alarm owners to buy systems that are less sensitive to lightning and power surges. Commissioners are scheduled to vote on the issue at a 6 p.m. meeting Thursday at City Hall, 112 S Osceola Ave.