The police major general who headed the rape investigation, Surachate Hakparn, said in an interview with The Times that the police have cracked down on crime syndicates on Koh Tao since the backpackers’ double killing.
“We admit that in the past, there was a mafia there that took advantage of tourists,” he said. “Today, we have gotten rid of them.”
https://www.nytimes.com/2018/11/03/world/asia/thailand-koh-tao-death-island.html