A special robbery

Nowadays a bank robbery happened in America, two of about 12 to 14-year-old girl swept away a huge amount of cash easily.Cincinnati police are doing their best to find their traces. According to the police,at the afternoon of January 5,two girls went into a small bank office,then one of them quietly stood at the entrance, just to escape the surveillance video of the bank, while the another one walked straight up to the counter, and showed a note to a staff, claiming that they have a gun and asked a paper bag which was full of cash.The staff was very surprised, and she had to do in accordance with the requirements of the note, but she also put special money which can be installed to track the use of the money into the bag.