I would make law that the highest bill denomination would be lowered to $20 bills. Give everyone until a certain date to exchange their $100s for $20s. (Are $1000s even legal out there still? ..if so, they will be worthless as well)

For everyday purchases, I think the American people can handle a few more bills..but for these big money stealing criminals..it will make it much harder.

When these criminals come into the banks, exchanges, etc to exchange their currency we can do thorough BG checks on the one's that bring in so many. Do you think criminals will bring in their $100s?

Now try to ship pallets of Billions (in $20s) around the globe. lol This would curtail their money laundering immensely.