A bill counter equipped with counterfeit-detection technology can combine note counting with additional verification functions. Depending on the model and currency supported, detection systems may include ultraviolet, magnetic, infrared or other authentication technologies. These features can alert operators when a potentially suspicious note is identified. The machine is suitable for retail stores, banks, supermarkets, hotels, currency-handling businesses and cash offices. It can be particularly useful when employees process large stacks where individual manual inspection would be time-consuming. Users should always follow local currency-security procedures because detection capabilities vary by machine and denomination.