Masks ‘Don't Work,' Grapevine-Colleyville ISD Trustee Says as District Changes COVID-19 Protocols The district is keeping its mask policy in place after a meeting where board member Casey Ford said masks ‘don’t work’ and that ‘science does not prove it.’ By Anna Caplan, The Dallas Morning News • Published 2 hours ago • Updated 2 hours ago Grapevine-Colleyville ISD is changing its COVID-19 protocols following a vote by its board Monday night. While the use of plexiglass is now optional at the elementary-school level, a mask mandate will continue to be in place, despite board trustee Casey Ford’s remarks that he believes they do not work.