I heard an ex-BP agent on the Roger Hedgecock show today. He said that he's in touch with active agents and they're telling him that some supervisory agents are sympathetic to Mexico. He named one specifically (last name Olmos, don't remember the first) and said she is inhibiting apprehensions by denying agents equipment like night vision goggle, and she's sending agents to cover areas that are quiet instead of areas that have a lot of activity.
I don't know if the guy's right, but I can see where if one wanted to fudge the numbers and make it look like apprehensions have dropped, it wouldn't be too hard to do it.
Bingo. And... even if someone were deliberately playing with the numbers, we'd never know one way or the other. It's not as though we've been accounting for every illegal that crosses, or even a substantial percentage. IOW, any "reduction" is pure speculation at best, and probably worse than that - a deliberate, agenda-driven lie to make the American people think the problem is under control.