Powerful UV light further checks for counterfeit money by revealing the hidden security stripe embedded in all US currency $5 and higher.
This is especially important for detecting 'bleached' bills, which are a growing problem. These are $1s and $5s which have had the original ink removed. Counterfeiters then over-print with a higher denomination. This process is done to fool the Counterfeit Detector Pen. The UV light picks up the security stripes, which cannot be duplicated by counterfeiters.
This is also great for authenticating passports, credit cards, traveler’s checks, and drivers licenses.