Here. An excerpt:
A common scheme involves debt collection. Someone using the name of a lawyer will call or send letters to victims warning them to pay up or face criminal charges. There may or may not be a real debt. But some recipients will pay without questioning. Others get angry and track down the "attorney's" name on the bar's website. That's often the first time a lawyer learns someone has swiped his or her identity.
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But the bar has no authority over non-lawyers. And warnings to scam artists usually just lead to the suspect disappearing for awhile only to pop up later with a new name and scheme, said [senior trial counsel in the California State Bar's office of intake] Horton-Billard.
(hat tip: Arundhati Satkalmi)