Buffalo Bills defensive tackle Marcell Dareus has spent the past three months sticking to his vow to focus solely on football. And he has no intention of deviating off course.

"Interview over," Dareus said Tuesday when the topic of his spring off-field troubles was broached.

Following an offseason in which he got off on the wrong foot by being arrested for drug possession and car-racing, Dareus' commitment to doing all the right things is showing signs of paying off.

The 2011 first-round draft pick is having a breakout campaign, anchoring an attacking defense that leads the NFL with 34 sacks as Buffalo (5-4) prepares to play at Miami (5-4) on Thursday night.

Dareus has a single-season best 10 sacks already, which ranks first among NFL defensive linemen and fourth overall.

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