Arapahoe County Sheriff Grayson Robinson told Denver television station CBS4 on Tuesday night that the Denver Broncos' troubled star was cited last week for driving without a license and speeding near his home.
Robinson said Miller was with his father, who was then allowed to drive the vehicle.
The Broncos declined comment on Miller's latest legal troubles when contacted by The Associated Press.
In addition to the six-game suspension he's serving for violating the NFL's substance-abuse policy, Miller was arrested last month while trying to purchase a firearm when a routine background check revealed he had an outstanding warrant.
In that case, Miller failed to appear for a court hearing on charges from last October when he was cited for careless driving and not having a license or proof of insurance.
CBS4 reported that Miller's most recent citation came about when a routine computer check showed Miller's license had already been suspended.
It's unclear when Miller is due in court on last week's charges because the citations aren't listed yet in online court records.
The AP left a message with Robinson late Tuesday night that wasn't immediately returned.
Miller had 30 sacks in his first two NFL seasons. He was the Defensive Rookie of the Year in 2011 after the Broncos made him the second overall pick out of Texas A&M.
He set the franchise record with 18½ sacks last season, leading Broncos Executive Vice President to call him the best player he's ever seen.
Miller first made headlines in the offseason when he guaranteed the Broncos would win the Super Bowl, but he can't start to back up that boast until Week 7 when Denver plays at Indianapolis.
Miller's suspension will cost him $800,000 in salary and potentially another $1.2 million in prorated signing bonuses.
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