What is shadow marking?

Shadow marking is a technique used by law enforcement agencies to track the movement of suspects and criminals. It involves marking the suspect or criminal with a substance that is invisible to the naked eye but can be detected using UV lights. This technique is often used during undercover operations, surveillance, and in cases where physical evidence is hard to obtain. Shadow marking is also used by retailers to prevent theft and by hospitals to track equipment. It is an effective way to deter crime and catch criminals. However, shadow marking does have some limitations, as the marking substance can fade or be washed off, and it may not be suitable in all situations, such as those involving sensitive skin or health issues.