EXPERTS gave evidence about DNA, hair strands, toxicology and other forensics to the inquest.
Chemist and forensic expert Julie Adams said there were fatal levels of heroin in Rachel's body at the time of death, but she could not conclude whether she died slowly or quickly.
Dr Wilfred Basley, a DNA expert, said his tests were inconclusive and could not provide definitive samples from much of Rachel's drug paraphernalia.
Professor Alexander Forrest said he could not disprove that Rachel's body was moved.
"If you're in a position in which Rachel was found it's more likely to result in a quick death than a slow death.
"You're going to be pressing against your chest, and your ribs are going to be splintered," he said. "As far as I'm concerned, she was a heroin user at the time of her death.
"On the level of balance of probability, I believe it was probably a quick death, but I cannot be certain and I cannot exclude the possibility of a slow death with subsequent repositioning."
He said it was unlikely that Rachel would recap a syringe while high - yet a capped needle was discovered by her body.
"Taking heroin is like drowning in strawberry jam," he added. "When under its influence you wouldn't be able to carry out the simplest of tasks."
He also dispelled a theory that morphine was involved, because it is a by-product of heroin when broken down by the blood.
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