Officials are waiting for the results of drug tests on the driver and assistant of a speedboat that hit rocks off Phuket on Sunday afternoon, killing a Russian girl and injuring nine others.
Phuket's deputy health chief said on Monday that an initial test on Natthawut Wongwilai, the 41-year-old boat driver, found a substance in the amphetamine category.
The assistant of the speedboat also underwent a drug test, the results of which are awaited.
The boat hit rocks near Koh Mai Thon island "at high speed" when it was carrying seven Russian tourists back from the Phi Phi islands at about 3.20pm on Sunday. Neither the weather nor the waves posed any danger for boats at the time.
A five-year-old Russian girl died in the crash, and seven other Russian tourists were injured, three of whom have already been discharged from hospitals. The two others injured were the boat driver and the assistant.
The driver sustained multiple wounds on his face. He was on a respirator and would need an operation.
Among those injured, a 45-year-old Russian woman suffered a punctured liver and broken pelvis. A Russian man had ruptured lungs, while a three-year-old Russian child suffered an impact to the head.
