Former drug detectives explain the likely reason cocaine worth tens of millions of dollars is washing onto NSW beaches

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Former drug investigators have shed more light on the likely reason the cocaine worth tens of millions of dollars that's washing up on NSW beaches was loose in the water in the first place.

NSW Police have now recovered 253 tightly bound 1-kilogram packages of the illicit drug since the first popped up on Magenta Beach on the Central Coast on December 22.