The problem: Students are promised merit scholarships to 'bait' them to attend a particular law school. The students are told that they will continue to receive their merit scholarships if they maintain a B or better. Since law school grading is on a curve, it is not mathematically feasible for all of the students who came in with merit scholarships to maintain a B or better. Many students end up losing the merit scholarships ('switch') that persuaded them to attend that particular law school in the first place.
After a New York Times article brought this information to light, the ABA decided to look into scholarship retention rates. Yay! proactive legal education reform.