They are claiming that you committed the violation for their alleged probable cause
for the stop. They have to prove you committed the violation in court
beyond a reasonable doubt and it becomes your word against the officer's word and you will have to fight this in court. Most of the time the parish attorney will dismiss these citations, but you will have to appear and argue that it was given merely as a pretext for the stop. Also, your son's attorney will have to argue this in the probable cause hearing in his marijuana case as well. Your son did right in not making any statements at all and proof that they knew who the friend was and that they likely did follow you from the house is going to be proof in your favor that their claim of the turn signal was merely pretextual to make the stop for the marijuana which they knew you did not have but your son had.
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