" WTF"Bank has to report anything over $100.00 now

My wife went to the bank today in Iowa. She had (2) $100.00 bills that she need changed into $20.00’s. The bank teller told her anything over $100.00 has to be first deposited because under the new law anything over $100.00 in cash has to be tracked. When did it go from $10,000.00 to $100.00? This is crazy. Has anyone else saw this or had it happen to them?