I can verify the fact if you're at DI you can't go after some DIII recruits - and be careful, because if you don't know, it's not an "obvious" thing and can be frustrating to find out.
I had a guy transfer out and wanted to keep my class sizes the same, so I went after one of the few seniors (juco 1 yr left) available. Since I searched all levels for juco 1 yr players and I rarely go after jucos, I had no idea by his rating or any other information he was a DIII player.
I sent him some effort and he's considering me, but every time I offer a scholarship, it didn't go through, the money is returned, and the only hint you get is a very vague sarcastic message from your AD with references to the show Punk'd and Ashton Kutcher. It's incredibly unclear, so I kept pouring effort into the guy only to find out after the fact from others on here what was going on.
So if you're at DI - even low DI - and you offer a scholarship and the money is returned to you and it just won't work, check to see if it's a DIII player and you didn't know it somehow, because I had to learn the hard way, and I've even been playing long enough I've seen most things by now.