Marking bills is a technique used by

police The police are Law enforcement organization, a constituted body of Law enforcement officer, people empowered by a State (polity), state with the aim of Law enforcement, enforcing the law and protecting the Public order policing, public order ...

to trace and identify money used in illegal activities. The serial numbers of the bills are recorded, and sometimes markings are made on the bank notes themselves (such as with a highlighter or other writing). Non-law enforcement uses of marking bills may be as simple as distinctive text on the bank notes, or recording serial numbers in the event of a

robbery Robbery is the crime of taking or attempting to take anything of value by force, threat of force, or use of fear. According to common law, robbery is defined as taking the property of another, with the intent to permanently deprive the person o ...

References

Law enforcement techniques {{law-enforcement-stub