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Jodie Power's brain was "so fried" by drugs, and her malice towards Mercedes Corby was so great, she thought she could lie in the witness box and get away with it, a court has been told.

Closing Ms Corby's defamation case against the Seven Network today, barrister Stuart Littlemore QC attacked Ms Power's credibility, labelling her a "doper" who would sell out her own children for drugs.

Ms Corby, the sister of convicted drug smuggler Schapelle Corby, is suing Seven over interviews with Ms Power, screened last February, in which she claims she was falsely portrayed as a drug dealer and smuggler.

"She's no drug dealer, she's no drug smuggler and she's in no way involved with drugs," Mr Littlemore told the court.

Ms Corby was a "courageous" and honest Australian mother of three children, Mr Littlemore said, while her former best friend had been shown as a "shamefully irresponsible" woman who was driven by a lust for money and fame and hatred for the Corby family.

Ms Power used her mother's pension to daily take drugs whilst holidaying in Thailand and had been proven as a liar under oath, he said.

"When you come to judge her credibility, it's impossible to put too much emphasis on the fact that Jodie Power has been proved to have lied on oath for her own financial gain," Mr Littlemore said.

Ms Power was given $A100,000 ($NZ123,426) and two all-expenses paid overseas holidays for her story, he said, money which Seven was never likely to see again.

"They're not going to get blood out of a stone, or a stoner," Mr Littlemore quipped.

"This was a woman with no job, no prospects of a job, no money, no savings... two boys to look after and drug dealers to pay.

"If there was one thing crystal clear to Jodie Power, it was this: no show, no dough."

Mr Littlemore told the court Ms Power would "even lie about lying" if she thought she could get away with it.

He also questioned Ms Power's public claims at the time the show was screened that she would use the money to repay donors to Schapelle Corby's fighting fund, and to feed a starving African village.

"The donors got not one cent and the little African village didn't even get a second-hand penis pipe," Mr Littlemore said, prompting titters from the public gallery.

Ms Power had contradicted and corrected herself in the witness box on a number of issues, including regarding her claims Ms Corby's brother, Michael, had regularly sold her drugs at a time when he was only a schoolboy, Mr Littlemore argued.

"Perhaps her drug abuse has left her in a fog about where she was and what she was doing," he said.

"Ms Power's brain is so fried, her malice is so great, that she tried to tell you this story."

To call Ms Power a whistleblower was a "nonsense", Mr Littlemore said.

"Whistleblowers are not paid, in fact they usually lose their jobs," he said.

"Whistleblowers don't go to Channel Seven, they go to the authorities."

The trial continues before Justice Carolyn Simpson.

AAP

[JohnCenaFan28]

Interesting story, thanks.