Lesley Mathis knows what her daughter said was wrong. But she never expected the 13-year-old girl would get arrested for it.

The teenage girl made an offensive joke while chatting online with her classmates, triggering the school’s surveillance software .

Before the morning was even over, the Tennessee eighth grader was under arrest. She was interrogated, strip-searched and spent the night in a jail cell, her mother says.

Earlier in the day, her friends had teased the teen about her tanned complexion and called her “Mexican,” even though she’s not. When a friend asked what she was planning for Thursday, she wrote: “on Thursday we kill all the Mexico’s.”

Mathis said the comments were “wrong” and “stupid,” but context showed they were not a threat.

“It made me feel like, is this the A

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