One of the main problems with that body was the total inability to enforce orders on down the line. There was an awful lot of autonomy even at the platoon level -- my gg grandfather's company ELECTED their officers every so often . . . and there is constant trouble -- mentioned frequently in his letters -- with getting even discipline, let alone orders from On High, enforced. As Willie said to Joe in a more recent conflict, "Drink it all. That guy who put out the order about shavin' ain't comin' up here."
It doesn't matter what "the law" or the Army Regulation was - you'll have to look down at least to brigade and probably to regimental level to find out what was really going on.
the rebel army was MOSTLY state, privately-raised & local units and a FEW PACSA troops.
damn few state, local OR privately raised units cared anything about what the Richmond bureaucrats wanted. mostly, they IGNORED the orders that camr down from the PACSA staff or "misunderstood" the orders.
free dixie,sw
Which is why it was not uncommon to find blacks being used in a supporting role - teamsters, cooks, servants and the like - in spite of the fact that it was against the law to do so. But combat soldiers? Not likely.