When arguing for a bail reduction, the best place to start is by looking up the statutory bail for the crimes he is being charged with. Each county varies. Then compare your son's bail to the statutory bail - is it higher? lower? The other bail considerations then are "flight risk" (how likely is the person to return to court, does he have a history of missing court dates, etc.) and "public safety" (is he charged with a non-violent crime or a violent crime, etc.)