Mischa Barton blames mental breakdown on GHB: drugs push O.C. star's weight loss, rant?

Mischa Barton, star of "The O.C." claims her bizarre mental breakdown was caused by drugging with a date rape drug called GBH while partying. The actress warns young girls to beware of drinks being accidentally doped by Ecstasy or similar substances. But many wonder which came first, the drugs or the alcohol? Others wonder if substance abuse is behind her yo-yo weight loss. The actor (who plays Marissa Cooper), was arrested for DUI and spent time in a mental hospital.  Mischa Barton blames breakdown on GHB: drugs push O.C. star's weight loss, rant?