'Former boxing world champion br Johnny Tapia was in critical condition br at a Los Vega hospital br after apparently falling at his home br br and losing consciousness br early Saturday, hours after br he was charged with br possessing drug paraphernalia. br br Tapia, a five -time world chanpion br with a history of problems with the law and drugs br had returned to his home in Las Vegas br after the confrontation with poilce br br and was with his wife, Teresa, br when he fell br according to Trayce Zimmerman, br Tapia's publicist. br br '(Teresa) said he felt depressed, br and then he just fell down br and lost consciousness.' br Zimmerman said. br br Tapia,35 was placed br on a respirator and was br being treated for head trama br Zimmerman said. - Assiciated Pressbr br Tom J.