Technique to trace money used in illegal activities
Marking bills is a technique used by police to trace and identify money used in illegal activities.[1][2] The serial numbers of the bills are recorded, and sometimes markings are made on the bank notes themselves (such as with a highlighter[3] or other writing[4]).
Non-law enforcement uses of marking bills may be as simple as distinctive text[5] on the bank notes, or recording serial numbers in the event of a robbery.[6]
