By Mark Bullock March 26 at 2:10 PM  Until he admitted to failing a drug test at the NFL combine, Randy Gregory had long been a projected top-10 pick who was often linked with the Redskins. But this week Gregory revealed he had tested positive for marijuana at the combine; his third in 15 months dating from college. He claims not to have smoked any marijuana since December, but still tested positive two months later at the combine.  This raises multiple red flags for teams. Failing a drug test at the combine sounds alarm bells. It not only brings the question of taking the drug and if he can be trusted not to take it again, but also raises doubts over his commitment to the game. Failing the one test you know is coming and have known is coming for months, suggests concerning ignorance or that he just doesn’t care.  NFL teams will also wonder why Gregory would still be smoking marijuana as recently as December. He had already failed two drugs test at Nebraska and been warned he would be kicked off the team if he failed again. Throw in the fact he failed to qualify academically for Purdue and teams have a lot of questions that Gregory needs to answer.  The top 10 seems out of the question for Gregory now. The question now becomes how far he falls. Kansas City Chiefs pass rusher Justin Houston failed a drug test at the combine and fell to the third round in 2011 (He led the NFL with 22 sacks in 2014). However, Detroit Lions wide receiver Calvin Johnson tested positive for marijuana at the combine and still went second overall in 2007.  Gregory’s talent on the field isn’t questioned. From purely that perspective, he’s still one of the best pass rushers in this class, if not the best. He combines an athletic frame (6 feet 5, 235 pounds) with strong technique to provide pressure off the edge.  Here, you can see how well Gregory uses his hands to help him beat blockers. He gets his left hand firmly planted in the chest of the left tackle, using his long arms to keep the tackle at a distance. The tackle leans forward ever so slightly and Gregory quickly drops his hands, pulls the tackle towards him and off balance. He then slips past and chases down the quarterback, who does a good job getting rid of the ball quickly.  [A closer look at draft prospect Vic Beasley]  Gregory’s hand usage is a big strength. He used his hands to beat the tackle to the outside, but he can also use them to get inside if a tackle over-sets on the edge.  This time, Gregory takes a few steps to the outside to sell a rush on the edge. Once the tackle takes the extra kick-slide step to the edge, Gregory uses a club-and-swim move to knock away the tackle’s hands and work inside. The tackle does his best to recover and manages to push Gregory off balance, but the rush was still effective. Gregory’s pressure forced the quarterback to make an awkward throw off his back foot to a check-down target.  Gregory has an edge rush and a variety of inside moves. But when the time is right, he also has a bull rush that can drive tackles back towards the quarterback.  Once again, hand placement is key. Gregory is up against Miami tackle Ereck Flowers, a projected first- or second-round pick. Flowers is known for having slow feet with a questionable kick-slide but compensates with strength. Gregory’s speed off the edge was a big threat to Flowers, which led to Flowers focusing on the speed rush. On this play, Gregory surprises him with a bull rush instead. He initiates contact at the perfect time, getting his hands inside and on the chest of Flowers. This catches Flowers off balance and allows Gregory to get underneath him and drive him back towards the quarterback. While Gregory doesn’t come away with the sack, he still forces the quarterback to panic in the pocket and hurries a poor throw.  Gregory has proven to be a versatile rusher. Throughout his time at Nebraska, he lined up as a 4-3 end, a 3-4 rush linebacker and even at times as a pure linebacker in nickel and dime sub-packages. He rushed from a variety of different positions, often switching between rushing the right and left tackle throughout the game to get the best matchup.  Having caused Flowers trouble, Gregory flips sides to have a try against the right tackle. Gregory again displays good technique, faking inside to stop the tackle from moving his feet before cutting back outside to the edge. The right tackle simply can’t get his feet going again quick enough, which allows Gregory to work through the clear holding penalty and still knock the quarterback’s throwing arm.  This kind of versatility, particularly to 3-4 teams that like to disguise blitzes and move rushers around, is a huge plus. But ultimately, his talent isn’t the question when it comes to Gregory. Teams will have to evaluate the risk against the reward of drafting him. His talent is undeniable, but so are his many red flags. He’s probably too risky to take with the fifth overall pick for the Redskins. But should he be available to them at a later pick, then the potential reward might outweigh the risk.  Mark Bullock is The Insider’s Outsider, sharing his Redskins impressions without the benefit of access to the team. For more, click here.  Gruden isn’t counting out DeAngelo Hall  Redskins thought Culliver was the best available cornerback  D.C. 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Here's a closer look at why the Nebraska outside linebacker had been coveted at the top of the draft, and why he might fall.