How do I know if my stop was unconstitutional?

Question Details: One night a friend and I, both minors, were driving to get something to eat and then go back to her house. We did have marijuana and paraphernalia on us illegally however we didn't do anything illegal so as to get us pulled over. When I asked why we got pulled over, the officer never answered me but just proceeded to ask how much marijuana we had and then he took it. We both then had to get out of the car and go to separate squad cars. I asked my officer why we were pulled over but he couldn't give me any information due to the fact that he was the backing officer. Later I then found out that the officer waited until my friend's parents arrived to say anything about why we were pulled over and all he said was traffic violation and he never specified what we ever did wrong. My friend who was the one driving never even got a ticket for any type of traffic violation. If the stop was legal and if there's anything we can do to contest it?

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