Sources say that no illegal narcotics or alchohol were found in her body, but that she was behind the wheel while impaired by prescription medication.

The September arrest of Locklear, 47, was unusual in that a former Us staffer called 911 on the Dynasty and Melrose Place actress and then sold pictures of her arrest.

At the time, it appeared that Locklear might have been set up.

"She seemed to be acting totally normal," a resident said.  "I was really surprised to hear she got a DUI because, I mean, I just saw her coming out of the store. She looked fine."

Toxicology tests apparently indicated otherwise.

The prescription medications found in Locklear's system "could have impaired her ability to safely drive a motor vehicle," Santa Barbara County Deputy District Attorney Lee Carter stated.

Heather's ex-husband, Bon Jovi guitarist Richie Sambora, was charged with a DUI in a separate incident on March 25.  At the time of his arrest, Sambora had the ten-year-old daughter he shares with Locklear in the car with him.

There were no passengers in Locklear's incident.