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(Yahoo!) The Baltimore Ravens suffered a huge blow to their playoff hopes, losing arguably their best defensive player for the rest of the regular season.

Defensive tackle Haloti Ngata, a five-time Pro Bowler and two-time first-team All-Pro, has been suspended for four games for violating the league's policy on performance-enhancing drugs. The Ravens have just four games left, so he's done for the rest of the regular season.

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Ngata, a 6-4, 340-pound force of nature who moves so well he has two interceptions this season, said he failed the test for using Adderall, a drug used to treat attention deficit hyperactivity disorder (ADHD). The NFL does not announce specific reasons for failed drug tests.

Whatever the reason, the Ravens are now without one of their best players for a big stretch of games. Baltimore is 7-5, one of six AFC teams tied at 7-5 for the final wild-card spot. Every other team's chances look a little bit better after this news.

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