1. In order to check compliance with the obligation to declare laid down in Article 3, officials of the competent authorities shall be empowered, in accordance with the conditions laid down under national legislation, to carry out controls on natural persons, their baggage and their means of transport.
2. In the event of failure to comply with the obligation to declare laid down in Article 3, cash may be detained by administrative decision in accordance with the conditions laid down under national legislation.