If the police find drugs on you during a traffic stop, can they not charge you right then and then later come back and charge you?

Question Details: On Monday, I was pulled over for speeding on and had a warrant for failure to appear on a traffic violation. When he was arresting me he checked my pockets and found drugs. He laid what he found on the seat of his car and asked me if I would be willing to work with them. If so, I would not be charged with those and a narcotics officer would be in touch with me on Wednesday. Is this legal? I told him yes but with no intentions of doing this, just was hoping to get out of drug charges for the moment. So what happened to the evidence? What do I do?

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