The President wrote:
But that's the problem. Without facts, we don't know if the problem is 50% or 1%.
The solution is easy though, does it really matter.
I'm not advocating cutting off the program, but you'd never get accurate numbers for this. The government isn't tracking it, so it would have to come from the colleges. They have a good reason not to want this type of thing to change. They make 50 grand selling people a worthless degree, of course they are inclined to be a little less open about it. But students can print off their grades for free at the local library, or they could just e-mail it to whomever. It's a very easy fix to this problem.
Now if I had to guess I'd say it was a pretty good number of people. Just anectdotally I know people who have seen classes shrink by 50% after the students got their checks from the government. This is at three different institutions. That doesn't represent hard evidence, but I think it is easy to see why I would ask the government to make sure the money they spend is actually being used for the its intended purpose.