Now that dominant defensive tackle Haloti Ngata has been suspended for four games for testing positive for Adderall, a violation of the NFL performance-enhancing drug policy, the Ravens will have to make an unwanted to adjustment to life without the five-time Pro Bowl selection. Ngata is a rare run-stopping, pass-rushing presence who's also capable of intercepting and disrupting passes. Without Ngata in the lineup, the Ravens will go with rookie second-round NFL draft pick Timmy Jernigan as his main replacement. Jernigan has displayed some playmaking ability, but he's not Ngata. It will take a rotation of defensive linemen providing assistance to Jernigan to come close to approaching Ngata's production. How not having Ngata will affect inside linebacker C.J. Mosley and Daryl Smith remains to be seen. With Ngata in the front seven, the Ravens were allowing just 86.3 yards rushing per game to rank fourth in the NFL. Ngata's absence could also limit the impact of outside linebacker Elvis Dumervil, the Ravens' leading pass rusher with 12.5 sacks. Eleven of the 28 sacks allowed by the Dolphins have happened in the past four games, an escalating problem with standout offensive tackle Branden Albert out for the season with a torn anterior cruciate ligament.