Here began a mystery so baffling that even now, police, scientists, the coroner, have been unable to say why or by what means this man and this woman died.

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You know why we're here to try and figure out what happened to Dr. Bogle and Mrs. Margaret Chandler.

Let's get right to it.

First, we have to tie up any remaining loose ends around the more fringe ideas before we can take a good

hard look at the two theories I think can best explain what happened.

The first of the fringe theories that I believe we can shut the door on is an LSD overdose.

The 1990s saw a renewed interest in this theory, and even those in the scientific community

decided it was an open and shut case of LSD overdose.

There were developments in how to test for LSD, and they decided to take one more shot

at testing the few remaining tissue samples for the chemical.

In 1994, the New South Wales Institute of Forensic Medicine

sent small tissue samples to the United States to be tested

using a new technique called radioimmuno-assay.

But there was a caveat.

The samples had been preserved in a chemical called formalin, which tends to

interfere with toxicological analysis because it degrades molecules and alters acidity levels.

The scientists testing the samples had to freeze these in small amounts to evaporate the

formalin, and it wasn't until two years later in 96 that the first

round of testing returned, a positive hit for LSD. The exact quantity of the drug wasn't clear,

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