Cops abduct 6-y-o for going to the store on her own, initially refuse to return to her dad

Emily is six, and her dad wants her to be independent. The local law, not so much. When he let her cross the street on her own, a cop picked her up and detained her and her dad for half an hour, before admitting that it wasn't illegal to let a six year old cross the street. But things really kicked off when dad let Emily go to the store, a few blocks away. The cops detained her, and when her dad went to pick her up, the law wouldn't let him, calling Child Protective Services instead and only relenting when CPS told them they were too busy to intervene — though they did follow up with a threatening letter to Emily's dad.

Once I got to the police station they would not release her to me for over 20 minutes, though she was sitting behind bullet-proof glass just 20 feet away. When the police finally came to talk to me, I was told that they had responded to a call of a young child being unsupervised. They refused to identify a reasonable cause for her detention, or even what law had been broken. They insisted that they were waiting for CPS to respond before they would let me see my daughter, but then they later came back and said that they were releasing me to her because CPS had told them to give her to me, since I was waiting for her.
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I received a letter from CPS today.

Emily knows her name, address, phone number, etc. Furthermore, the responding officer knows exactly who both Emily and I are since she responded to a complaint regarding Emily crossing the street by herself just a few days prior, during which we were detained for more than half an hour. After this previous incident her supervisor had confirmed that there was no law against a child crossing the street by themselves.

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