Ms Sainsbury's lawyers were seeking to stop Sunday Night from airing an exclusive interview with Ms Sainsbury's fiance Scott Broadbridge, however their application for an injunction was dismissed by Justice John Sackar following a closed hearing on Sunday.

The Seven program teaser claimed Mr Broadbridge would "break his silence to reveal the untold truth" about the incident that saw the 22-year-old Adelaide woman imprisoned for allegedly attempting to smuggle 5.8 kilograms of cocaine on to flight headed from Bogota to London on April 11.

Given the all-clear to air, Sunday Night, who signed a deal with Mr Broadbridge for an undisclosed figure, will now go head-to-to head with Channel Nine's 60 Minutes at 8.30pm on Sunday evening, which will feature exclusive allegations of its own.

Nine's 60 Minutes reporter Liam Bartlett claims Mr Broadbridge, who travelled to Bogota earlier this month, had now become a person of interest in Ms Sainsbury's case.

"We have established here, had it confirmed from the prosecutor's office, that the Colombian prosecutor now considers Scott, the fiance, a person of interest in the investigation," Mr Bartlett told Channel Nine.

"They want to interview him - sit down and ask him some questions. Over here, from what I can gather, the prosecutor's office has to rely on Scott volunteering to sit down."

Mr Broadbridge, who has not yet commented on the matter, has consistently maintained Ms Sainsbury is innocent.

"Cass is the delight of my life, I know that she is not involved in the drug trade," Mr Broadbridge told reporters in Adelaide before he flew over to Bogota with a crew from Sunday Night.

"I know that she was not deliberately taking drugs or carrying drugs.

"I know there are many unanswered questions in this case and I intend to work with the lawyers to get to the bottom of them," he said.

Mr Broadbridge said that he would support his fiancee through the ordeal and that he would still marry her.

"Cass and I are engaged to be married and I intend to marry her," he said.

Mr Broadbridge arrived at the El Buen Pastor women's prison in Bogota where Ms Sainsbury is being detained on May 16 carrying a single red rose. The meeting, which lasted about an hour according to Channel Nine, was the pair's first since Ms Sainsbury was arrested for alleged drug trafficking at El Dorado International Airport.

Colombian police, who were allegedly acting on a tip-off, said Ms Sainsbury was carrying 5.8 kilograms of cocaine concealed inside 15 pairs of headphones, which she claimed were gifts for her bridal party and friends.

Ms Sainsbury has denied any knowledge of the drugs and said she was given the headphones by a man she knew only as 'Angelo' who had been showing her around the Colombian capital.

If found guilty, Ms Sainsbury could face up to 20 years imprisonment, lawyer Orlando Herran said.