WASILLA, Alaska — A 42-year-old Wasilla woman was arrested Thursday at her home by Alaska State Troopers with a search warrant in an undercover drug investigation. Sherry L. Johnston was charged with six felony counts of misconduct involving a controlled substance.

Johnston is the mother of Levi Johnston, the Wasilla 18-year-old who received international attention in September when Gov. Sarah Palin and her husband, Todd, announced their teenage daughter was pregnant and he was the father. Bristol Palin, 18, is due on Saturday, according to a recent interview with the governor's father, Chuck Heath.

Troopers served the warrant at Johnston's home at the "conclusion of an undercover narcotics investigation," said a statement issued Thursday by the troopers as part of the normal daily summary of activity around the state.

Troopers charged Johnston with second-degree misconduct involving a controlled substance -- generally manufacturing or delivering drugs -- as well as fourth-degree misconduct involving controlled substances, or possession.

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