A North Texas woman has been arrested for posting Facebook photos of an undercover policeman who testified against her friend in court.

Mesquite police arrested Melissa Walthall, 30, for allegedly posting the photo of the officer, who authorities say recently testified in a drug case against her friend. Her Facebook post identified the person as an undercover officer, according to a federal affidavit.

After a caller tipped off Mesquite police to Walthall’s Facebook post about a week ago, an investigator found that it posed a “viable threat to that officer’s safety,” the affidavit said.

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