"I F THIS WERE JEOPARDY, the answer would be: "This talented defensive back, who has been suspended for 22 of the last 28 games, will rejoin the NFL today."The question would be: "Who is Pacman Jones?"That's right, today is the day that Adam"Pacman" Jones will be permitted to practice with the Dallas Cowboys. Mind you, he won't be able to play for 2 more weeks, bringing the total number of games the league suspended him for - this time - to six. And let us not forget that he was suspended for all of last season.Which brings us to an even more pertinent question: Why is he allowed back in the league at all? There is a simple three words answer: Because he's good.Does anyone really think that a third stringer would be given as many chances as Pacman? If so . . . think again.Sources told ESPN's Chris Mortensen yesterday that Jones' next misstep will result in a lifetime ban from the league. One missed counseling session or another wild night at a strip club and he's history.Jones missed all of last season while with the Titans for violating the league's conduct policy. Taken into account were numerous arrests andrun-ins with the police.In April, he was traded to the Cowboys and eventually given another chance by NFL commissioner Roger Goodell. But on Oct. 7 - just 6 weeks after being reinstated -"