Best friends Bianca Jones and Holly Bowles, both 19, were among those who died in Vang Vieng last November.
Laos authorities have rejected expert assistance from Australian Federal Police in investigating the deaths of six tourists, including two Melbourne teenagers, who died from suspected methanol poisoning at a backpackers' hostel.
Holly's father Shaun Bowles said: "They weren't doing anything wrong. They were having having a drink. Having fun. There's no way to determine if there is methanol in a drink. It is very much a silent killer."
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