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The Americans do love their defenitions. They seem to have an ability to lose any meaning within a jumbled mass of words...
Here's one from a Navigation and Vessel Inspection Circular (NVIC) which explains that the term 'Suspicious Vehicle' means:
QUOTE
a vehicle that by the totality of the circumstances surrounding its appearance or actions, including but not limited to operation contrary to posted guidance and the experience and training of the observing official, presents a particularised and objective basis to suspect that it is engaged in unusual or out of the ordinary behaviour.