‘Although customs could only exercise the power under section 139(1) of the Customs and Excise Management Act 1979 to detain goods when those goods were actually liable to forfeiture, they had a general power to detain goods which was ancillary to their power to examine them and conduct and investigation to ascertain whether they were so liable.’
WLR Daily, 11th June 2014
Source: www.iclr.co.uk