How does the NCAA have the time/manpower to investigate every player?
How do they even know who is who? Can't ISU (or whoever) just say he went to community college for two years and then stop at that?
Its a lot like your taxes... you can put down whatever you want. You just better hope you never get audited.
In all seriousness every player has to register with the Clearinghouse. From there the eligibility gets run and I am pretty sure school administrators have to sign off as well. Not 100% certain on the last part.