Arrest details on mom of Bristol Palin boyfriend

ANCHORAGE, Alaska — The mother of Bristol Palin's boyfriend sent text messages to two police informants discussing drug transactions before her arrest on felony drug charges, authorities say.

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An affidavit filed Monday says Sherry L. Johnston sent text messages referring to "coffee" as a code for the drug OxyContin.

The 42-year-old Johnston was arrested last week after state troopers served a search warrant at her Wasilla home. She is out on bail.

Johnston is the mother of 18-year-old Levi Johnston. Gov. Sarah Palin announced in September that her 18-year-old daughter Bristol was pregnant and Johnston was the father.

Authorities say the case began in the second week of September — a couple of weeks into Palin's campaign as Republican vice presidential candidate — when drug investigators intercepted a package containing 179 Oxycontin pills. That led to the arrest of the suspects, who agreed to be informants.

According to the affidavit, Johnson sent a text message to one informant on October 1, writing: "Hey, my phones are tapped and reporters and god knows who else is always following me and the family so no privacy. I will let u no when I can go for cof."

Ten days after Johnston said there wasn't enough privacy for a drug sale, she texted again to set up a meeting at a store, according to the affidavit. The document says the informant received $800 to make a purchase, meeting investigators later with 10 pills of 80-milligram Oxycontin.

A second purchase was made the following day, authorities said. This time the informant wore a hidden camera and a microphone.

A third purchase occurred Nov. 26. The informant was wired for the transaction and this time police videotaped the meeting.