Never know if you're playing devil's advocate or not! Should they look into it? Yes. Should players be forced into conducting interviews and answer questions? Not sure why. This is like the oldest line in the book from a cop asking you to turn your pockets out - "If you've got nothing to hide, why does it matter?"
disclaimer: I'm Canadian, most of what I know about US law I learned from 'The Practice'!
The way this is heading, it seems to me that signing a contract with the NFL effectively suspends your 5th amendment right?