It's expected that selling drugs is illegal.
John, a police officer, is patrolling the park when he notices Gary dealing cocaine.
John wants to say something to Gary.
John tells Gary that he's under arrest for the felony of selling Class A narcotics.
John tells Gary he ought to be doing that somewhere else where he can't be seen since it's immoral.
Gary is taken to jail and put away where he learns the lesson of obeying the law.
Gary leaves but simply sets up his operation somewhere else and continues to spread the evils of addiction.