Officers say alarmed drivers started calling in about seeing a child holding up a sign that read "help me, she's not my mom! Help!".
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CHP officers, as well as a K-9 unit, pulled the car over in Stockton only to find out it was a prank by the child, and the mother had no idea the girl had made the sign.
"This is a reminder that parents need to be aware of what their children are doing in the back seat at all times," said officers.
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CHP says six units responded to this call instead of responding to legitimate calls or patrolling their beats.