Can the police keep my laptop even after I was cleared by the court?

Question Details: A search warrant served on us for child porn because my brother's 7 year old uploaded herself stripping on YouTube. The police took all phones and computers. They brought my phone back 2 hours later and said it was clear. My brother went to court and got his daughter back after they determined this house was safe. The police returned all the devices except mine laptop and my mother's desktop. Upon requesting them back, we were told no since they hadn't yet sent them to forensics to be searched because they didn't have the passwords. We then offered the passwords, they still refused. I have nothing to do with this case; I was just visiting my mom for a few days. her phone is the device that the content was uploaded with and the cops had no interest in that. She was at work when they searched. What's really going on here?

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