Accused killer Bradley Scott Purkiss' DNA was found on the body of his alleged victim, a court has heard.
Dwayne Robert Davies' body was found wrapped in a blue tarp in a shallow grave at Levendale a week after he went missing on May 26, 2017.
Mr Purkiss and Mr Davies' wife, Margaret Anne Otto, are facing trial in the Hobart Supreme Court jointly accused with the murder.
The pair have pleaded not guilty.
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- Accused told police he was being framed for best friend's murder
- Court hears of accused killers' secret affair
- Accused denies knowledge of murder plot
Earlier in the trial, the court heard evidence Mr Davies' body was found wrapped in a blue tarp, bound with blue twine and clear tape.
Forensic scientist Rita Westbury told the court on Wednesday DNA matching Mr Purkiss was collected from the twine which had been tied around Mr Davies' body.
"It is 100 billion times more likely Bradley Purkiss is a contributor to that profile than he is not," Ms Westbury said.
The court heard a statistical likelihood of 100 billion is the highest probability possible when comparing DNA profiles.
Ms Westbury said a hair found on the clear tape wrapped around the body was a match to Mr Purkiss.
The court heard the presence of a person's DNA on an item does not mean that person touched it because it is possible for DNA to be transferred.
Mr Purkiss' defence lawyer Alan Hensley said there was no way to tell if the DNA was left on the twine when it was first used by Mr Purkiss to tie cannabis plants in his shed or when someone used it to tie Mr Davies' body.
The trial before Chief Justice Blow continues.