Rich men's sons were appointed to the socially outcast "overseer" occupation, but the measure was received in the country with "universal odium". The legislative vehicle was the controversial Twenty Negro Law that specifically exempted one white overseer or owner for every plantation with at least 20 slaves. Backpedalling six months later, Congress provided overseers under 45 could be exempted only if they held the occupation before the first Conscription Act. The number of officials under state exemptions appointed by state Governor patronage expanded significantly. By law, substitutes could not be subject to conscription, but instead of adding to Confederate manpower, unit officers in the field reported that over-50 and under-17-year-old substitutes made up to 90% of the desertions.