Thumbs Down to the Texas Legislature for passing what some experts call a rather weak law that attempts to monitor the safety of amusement rides. The law, which takes effect July 1, requires ride operators to carry at least $1 million in liability insurance. The insurance company must also examine and certify the ride’s safety-but only once each year. The problem, says San Antonio insurance executive Jerry Tucker, is that the rides are dismantled and moved several times during the year and are set up again in new locations. That’s where problems could develop and not be found in time to prevent an accident.