Students also probably don't want it. Fresh foods don't keep as well. I always felt more comfortable eating "crappy" food at school because it's hard to mess up. A couple wilted leaves in a salad doesn't really actually affect the quality, but it does turn you off from eating it. There's no where for me to wash the apple they gave me that was handled who knows how and possibly not washed before I'd be eating it.

The Chipotle debacle provides a bit of evidence that fresh and local isn't necessarily the easiest to quality control.