They are holding all three items as evidence.  Even though your son may simply be a weed user, they will most likely make the argument that because he had money and a gun in close proximity to the smoking device, that he is also a dealer.  The money would be proceeds of sales.  The gun would allegedly be used for his protection during drug deals..... at least these are the theories they will pitch to the prosecutor and a jury. Do not contact the officer.  Every contact is an opportunity for the officer to gather more information on your son.  Instead, you need to start lining up a criminal defense attorney for your son.  From there, the attorney can file requests for discovery to learn exactly how they intend to charge your son and to help your son reach a final resolution.  If the case is resolved favorably, then your son could secure a return of any non-illegal items.