I Googled  Microwave RFID U.S. dollars and found photos of the burning in Andrew Jackson's eye. What to believe -  RFID tags in the money, magnetic strips for anti-counterfieting, you guys? 
 Maybe you'se who tried need to leave it in a bit longer? Are you sure it was done? 
    I believe the U.S. dollars are 'tagged', sure. 
    Probably more to track the money than the people though. Cash in large piles, not in bank vaults, is likely crime-cash, and they can investigate. Maybe there is a stronger signal when they are together - electronics experts? 
  Are they tracking individuals? YES. How they would do that with money, since you can get my $20 bill on any given day, I don't know. 
 BTW, its still bumping me offline, last time with this same message but with links,URLs. Oddly, I was not bumped off with the first post I made today, on topic not about tracking people!! Its a weird life here anymore eh?