Can my ticker be dismissed if the reason that I was stopped in the first place was not valid?

Question Details: I was pulled over by a sheriff. He told me that his reason for stopping me was because my child's car seat was strapped in to the middle section of the back seat. I told him that my daughter wasn't in the vehicle and he stated that it didn't matter, that it was illegal for a child's car seat to be strapped into the center section. When it was all said and done, I was ticketed for driving with a suspended driver's license only, not a car seat violation. What with my being a first time parent I didn't know if he was right or wrong. After getting home, I did some research on state child safety laws, spoke to my pediatrician and to several child safety specialists and was told by all of them that the middle of the back seat was the safest place for my child to be as long as the car seat was correctly installed (and it was). Since his reason for stopping me was invalid I feel like the ticket should be invalid.

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