The euro counterfeiting can be characterized as a socially negative phenomenon, one of the most serious crime, which does not has impact any more only on the interest of one country or nation, but it attacks the financial interest of whole European union. That's why the European Union protects its currency by establishing institutions designated to protect the euro as well as by its legislation. But the main responsibility for the euro protection is on the member states. The Slovak republic as a member of the European Union and a part of the Euro zone provides an appropriate protection to the euro against counterfeiting. Introducing of the euro in Slovakia on 1 January 2009 had also impact on amount and structure of counterfeits seized in our territory. Despite the increasing number of counterfeits and their quality, the situation is considered to be established nowadays. The Police Force as a part of European Union Law enforcement agencies system is able to face this problem, but the effective combat against currency counterfeiting, that is known as a transnational crime, calls for officer's new requirements in form of specific knowledge and skills. Regarding the possibilities of the prevention in this field, the warning people by media in order to encourage them to be carefully when they manipulate with cash and pay attention to be able to detect counterfeits seems to be the best option. By this behaviour of people we could keep the circulation from being overloaded by counterfeits and avoid endangering the financial interest of the European Union as well as people.