King County has been exploring the idea for 10 years, but there’s been no decision on installation yet according to Terry White, deputy general Manager of King County Metro. White told KIRO 7 that none of the shield options tested so far have been good enough to install systemwide. “We don’t want to just put in something and find out we did the wrong thing and now we’ve cost the system and now we’ve got to pull it all out,” he said during a recent interview with KIRO 7.