from the link: FRISCO - Dallas Cowboys defensive tackle David Irving has missed "multiple'' mandatory drug tests in the last two months, sources tell me, putting in jeopardy not only any chance he has of participating with this team during the NFL Playoffs but also his chance of playing in the league anytime soon. Irving's off-field life continues to be plagued by legal turmoil largely related to conflict with his ex-girlfriend, with whom he shares a young daughter. And his on-field efforts have been marred in part by a high ankle sprain he sustained in practice on Nov. 2. But since incurring that injury, Irving has rarely shown up for work here inside The Star -- not only missing participation in practices, but also declining to attend practice as an observer, declining to attend meetings or watch film, and declining to accept rehab help with the ankle and encouragement to stay active in the weight room. "He's just sort of checked out,'' one person close to the situation tells me.