[L]aw schools added about 3,000 seats for first-year students from 1993 to 2008, [but] both the percentage and the number of black and Mexican-American law students declined in that period . . . in that same period, both groups improved their college grade-point averages and their scores on the Law School Admission Test . . . . "[the] scores and grades [of African-Americans and Mexican-Americans] are improving, and are very close to those of white applicants[.]”
Conrad Johnson "who oversees the Lawyering in the Digital Age Clinic at Columbia . . . collaborated with the Society of American Law Teachers to examine minority enrollment rates at American law schools."
From here. Study details here.
The study itself notes that 34% of white applicants, 46% of Mexican-American applicants and 61% of African-American applicants are "shut out" (i.e. not able to get into any of the law schools to which they applied).
Recent studies on race and the LSATs by the company that designs and administers the test can be found here.
In the 2005-2006 academic year, the mean LSAT scores by ethnicity were:
African-American 142.31 SD 8.39
Mexican-American 147.65 SD 8.68
Caucasion 152.71 SD 9.03
LSAT scores have, by design, a nearly perfect bell curve.
The quote from the study author above suggests that this gap has narrowed since this academic year.