Unfortunately affirmative action does not stop at the admissions office. A prominent attorney in Chicago of my acquaintance, an adjunct Prof at Northwestern U, resigned as a teacher because he was pressured into passing minorities who were not up to snuff. I guess it's only when you get to a completely merit based exam like the bar exam that all that stops.
Comparing admission rates with rates of passing the bar would be a really interesting exercise, thus combining law school drop out rates with bar failure rates.
One bright spot in all this is that by admitting unqualified candidates to law schools you effectively reduce the number of lawyers who eventually qualify to leech on the rest of society.
If I gave prospective employees a written exam which minorities tended to flunk, I would be sued for racial discrimination under the "disparate impact" rule. How long before the bar exam is cancelled for the same reasons