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This sounds extremely serious. It looks to me that law enforcement was conducting some type of undercover investigation and/or had an informant. The fact they released your son might mean that they are watching him to see if he would lead them to whoever is behind the drug runs.
Please do your son a favor, get a really good criminal attorney and do not talk to anyone and tell your son not to talk to anyone. This is very crucial, anything you or your son says can be used against him.