http://deepdot35wvmeyd5.onion/2017/03/28/danish-police-make-headway-darknet-investigations/
"Two employees could in an afternoon identify 150 suspected drug dealers in dark web. The cases are now being further developed. The analytical method creates endless opportunities to expose criminals transactions with bitcoins," she explained.
"We showed that the accused transferred certain amount of bitcoins to specific marketplaces on the Dark Web," Prosecutor Jesper Klyve said. "We knew the exact prices in those markets, so we multiplied up. It is similar to when we previously found drug accounts. It opens up new opportunities to investigate and prove serious crime."
TL;DR Low hanging fruit can't even be bothered to mix their coins after buying them on KYC exchanges, and all of a sudden the Danish popo are some kind of hot shit presenting their revolutionary techniques at international LEA conferences?
/YAWN
Nobody sends EXACTLY how much coins they need to buy something to their market wallet. People know that money is lost in transfer fees and small fluctuations in btc price.
This method seems really... ineffective? Pointless? Inaccurate? Imprecise? Not sure what word I'm looking for. Maybe all of the above.