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it can be charged as a felony or a misdemeanor at the discretion of the prosecutor. so with his criminal history i would venture to say they will go for the felony. the penalty is 6 months to 1 1/2 years in jail.
if there is nothing in the bag that identifies it as your son's, then it may be possible to have the matter tossed out - so he will want to have an attorney represent him. if he cannot afford an attorney, he can request the Public Defender to assist him