i was read my Miranda rights in the cop car on my way to jail, what does this mean

in regards to my arrest? i was arrest for poession of a controlled substance (xanax) however it was my buddies prescription bottle with his name on it. it just so happen that he ended up at the hospital that night so i could not give it back to him. when the cops showed up at my buddies party (not the same friend) i left the bottle on the counter and i got ratted out. Anyway i got handcuffed and interigated without my Miranda rights said to me, this happened for about 30min. long story short the cop read them to me on are way to jail. is the police evidence still valid ?
 
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