DNA implicating a man accused of drug trafficking was found inside concealed drawers in his bedroom alongside the drug ice and cannabis, a court has heard.
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However, the man's sister told the jury the seized cannabis, ice and cash belonged to their mother, a dead drug user who had a conviction for sale or supply.
Jeremy Scott Campbell is on trial in the ACT Supreme Court, having pleaded not guilty to trafficking methylamphetamine and cannabis.
In July 2009, police searched the home in Mawson that Campbell shared with his mother, Helen Patricia Campbell.
They found a stash of cash, cannabis and methylamphetamine, or ice, in concealed drawers in a bedroom.
Investigators discovered 111 grams of a crystalline powder containing 11.6 per cent pure methylamphetamine, almost 400 grams of cannabis and more than $26,000.
Also discovered on top of the drawers were Jeremy Campbell's wallet and a list of names and numbers, with the name ''mum'' at the top.
The Crown has alleged it is a ''tick list'', or a list of debts owed by drug buyers, and said it did not make sense for Helen Campbell to have written ''mum'' on her own tick list.
In an interview with police, Jeremy admitted that 15 grams of loose cannabis in a top drawer was his ''personal smoke'' but he denied knowledge of the contents of the secret compartments.
He also admitted the bedroom and the drawers were his.
His sister took the stand yesterday in his defence, saying her brother did not have a room at the house and described the bedroom in question as ''the spare room''.
The woman also said that she had seen her mother using the drawers in the bedroom, and that Helen Campbell had told her that she used the secret compartments to hide things from her son, who was a drug user.
Prosecutor Amanda Clarke suggested she was lying to the jury to protect her brother.
The witness denied this.
A police forensic biologist said a mixed DNA profile was lifted from bags found in the concealed drawers and compared with Jeremy Campbell.
She said the majority component was 2229 billion times more likely to have come from Campbell than a random unrelated male from Australia's caucasian population.
However, under cross-examination by defence barrister Michael Pickin, the biologist agreed that she would expect to find a person's DNA in a house where they had lived for months.
She also said that she was not an expert in the DNA ''transference'', when a person's DNA comes into contact with an item through indirect contact.
The trial before Justice John Burns and a jury continues today.