Joshua Duane Barnes , 18 , was last seen on 7th floor at the medical facility . He apparently tied bedsheets together and broke them , police report said . Department of criminal justice has tracking dogs , officers searching the building .
Joshua Duane Barnes , 21 , was last seen on 7th floor at Texas medical facility . He apparently tied bedsheets together and exited window , police official says . Department of criminal justice has tracking dogs , officers searching the area .