I am an attorney and am happy to help you with is.
Unfortunately, the presence of trickery
does not make an arrest unlawful. So long as the police had probably cause to stop you (in this case, a reasonable belief under the circumstances that your son had a warrant for his arrest and was in the vehicle), then they did nothing unlawful by doing so and taking your son into custody.
I wish I had better news for you. A tough part of being an attorney is being the bearer of bad news. However, if I was to lie and tell you what you want to hear, I would be doing you a huge disservice.
However, he should make note of this incident and bring it up in family court
at the next hearing. Using her son as bait to have her son's father arrested will not make his ex look good in court.
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