(3) Subject to this section, where a foreign vessel, proceeding from a port outside Saint Lucia, is passing through the territorial sea without having entered internal waters, a prescribed power may be exercised, in relation to any offence committed before the ship entered the territorial sea, on board the ship during that passage only if—
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(a) there are clear grounds for believing that the vessel has, in the exclusive economic zone, committed a violation of—
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(i) applicable international rules and standards for the prevention, reduction and control of pollution from vessels, or
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(ii) any provision of the Regulations or any enactment conforming to and giving effect to any such rules and standards; and
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(b) there—
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(i) are clear grounds for believing that that violation has resulted in a substantial discharge causing or threatening significant pollution of the marine environment, or
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(ii) is clear objective evidence that that violation has resulted in a discharge causing major damage or the threat of major damage to the coastline of Saint Lucia, or to any resources of its territorial sea or exclusive economic zone.