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Arthur T Knackerbracket has found the following story. However, having read the same source material it doesn't appear to me to say quite what The Register claims. A drug dealer has been arrested and it is disclosed that he was also dealing on the Dark Web. It does not state, in my reading, that the breakthrough in this case came as a result of his communications on the Dark Net being intercepted, but your interpretation may differ from mine:

Australian authorities say they can detect dark net transactions.

We know this because the nation's Border Force (ABF), the black-shirt wearing guardians of Australia's frontiers, says as much in its takedown notice of a "31-year-old man from Port Neill" in the State of South Australia. Said man fell foul of a joint ABF and South Australia Police (SAPOL) operation that "linked him to the importation and distribution of numerous border controlled drugs via the dark net."

"We are well aware of these websites and take any attempts to import illegal border controlled drugs very seriously," said Craig Palmer, the ABF's acting commander for immigration and customs enforcement. "

[...] The ABF hasn't previously publicised arrests made as a result of dark net activities, but early in 2016 advertised for workers with information security skills. Perhaps those hires' feet are well and truly under the desk? ®

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