If you are stopped and the police confiscate a substance but then they let you go, if it turns out to be an illegal substance, can they still charge you?

Question Details: I was stopped recently and the police found some questionable substances in my vehicle. They assumed it was heroin but said they were unsure. They took half of the substance and gave me the other half back and said they were going to have it analyzed at the lab and call me to decide further action. If this substance was found to be heroin, could they pursue criminal charges against me at a later date?

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