CNN  —  The father of an Australian teenager who died from methanol poisoning while on a backpacking holiday has issued a plea to the Laos government to fully investigate his daughter’s death and ensure such incidents don’t happen again. Bianca Jones, 19, was one of six foreign tourists who died in a suspected mass methanol poisoning in Vang Vieng , a popular backpacker destination in northern Laos. The deaths of two Australian teenagers, a British woman, an American man and two Danish women –