You may want to check this out:
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A particularly interesting paragraph:
Routine quality control tasting of bottled wine to check for TCA cork-taint during this same period by the winery's French-born winemaker, Daniel Docher, disclosed a pattern suggesting something was wrong. "We then sent eight bottles of the chardonnay to ETS Laboratories [in St. Helena] for analysis," Arnold recounts. "Five of the eight were found to contain measurable concentrations of TCA, at about 2.0 parts per trillion."
This is from TCA taint they traced back to a non-cork related sources.
The whole article is a very interesting read.
Andy