Artikel 9

1. On request, the requested Customs Administration shall, to the extent possible, maintain surveillance over and provide the requesting Customs Administration with information on:
a) goods, either in transport or in storage, known to have been used or suspected of being used to commit a customs offence in the territory of the State of the requesting Customs Administration;
b) means of transport known to have been used or suspected of being used to commit a customs offence in the territory of the State of the requesting Customs Administration;
c) premises in the territory of the State of the requested Customs Administration known to have been used or suspected of being used in connection with the commission of a customs offence in the territory of the State of the requesting Customs Administration.
2. Either Customs Administration may maintain such surveillance on its own initiative if it has reason to believe that activities planned, ongoing or completed appear to constitute a customs offence in the territory of the State of the other Customs Administration.