Busch has had brushes with the law twice before: in April 2006 he was issued a summons for the "chirping" (excessive squealing) of his tyres in a fast food parking lot in Richmond, Virgina; he pleaded guilty to improper driving and was fined $150 plus court costs. He was reportedly also cited for a more modest speeding offence (55mph on a 35mph zone) in Iredell County in 2008.
Busch is currently under probation with NASCAR after his pit lane altercation with Kevin Harvick at Darlington earlier in May, and it's not clear whether NASCAR officials may look into the incident and take action. Losing a regular driving license does not have any automatic repercussion on a driver's NASCAR license required to run in the championship.
However, NASCAR can take very seriously any public misbehaviour by drivers and team members that may reflect badly on the sport. Nationwide Series driver Michael Annett was recently put on probation for a year by NASCAR, after being caught driving four times over the legal limit in North Carolina in February.
Also on Tuesday, NASCAR announced that Gary Frost, a member of Jeff Burton's #31 pit crew, had been suspended indefinitely for violating the series' substance abuse policy.
The team subsequently followed up the NASCAR announcement with one of their own, stating: "Richard Childress Racing has zero tolerance when an employee fails a NASCAR drug test due to an illegal substance. As a result, that person's employment is terminated. It is important for our fans and our partners to know illegal drug use at RCR is simply not tolerated."