The Bali court trying Corby will on Monday be handed a two-paragraph letter from the federal government, alleging Australian airport baggage handlers may be involved in drug trafficking.

While the letter does not mention Corby by name, it gives credence to the 27-year-old Gold Coast woman's claims that someone in Australia put more than four kilograms of marijuana in her body board bag without her knowledge.

Mr. Howard said the federal government had prepared a letter for the court hearing Corby's case outlining claims that airport baggage handlers in Sydney had used luggage to traffic drugs.

The move has been supported by Opposition Leader Kim Beazley.

Fifteen people were charged last week after 9.9kg of cocaine was shipped through Sydney airport allegedly with the aid of corrupt baggage handlers. One Qantas baggage handler has been stood down.

Corby, 27, who is accused of smuggling 4.1kg of marijuana into Bali on October 8 last year, has begged Mr. Howard for justice, saying she is innocent.

However, Mr. Howard said he could not interfere with Corby's drugs trial in Bali, despite her pleas for him to help her return home.

"I cannot interfere in a justice system of another country.

"I cannot and would not interfere with the justice system of our own country.

"It's fundamental to our system of democracy that the executive arm of government doesn't interfere with the judiciary," he said.

"I know that if a foreigner were arrested in Australia and charged with an offence and the president or prime minister of another country started telling our courts what to do, Australia would be mightily angry.

"But having said all of that I feel for the girl, I think the whole country has been drawn into this and I can only repeat my fervent hope that the verdict is true and fair and right and just."

Mr. Beazley said he supported the government's moves to prepare a letter about the alleged trafficking by some airport baggage handlers.

Mr. Beazley said he backed the government's decision not to interfere with the Corby case.

"That's obviously the case, but your heart goes out to Schapelle Corby, it's a dreadful set of circumstances for her to find herself in."

Mr. Beazley added that if Corby is found guilty, the government should negotiate with Indonesia, to allow her to serve her time in an Australian prison.

"She's clearly deeply troubled, it's a very worrying time for her, the hearts of all Australians are with her.

"Now if the verdict goes the wrong way, and I sincerely hope she's acquitted, but if it goes in the opposite direction, then absolutely, clearly we have on our hands a situation where the government must complete its agreement with Indonesia, as it has with a number of other countries, for an exchange of prisoners, so you can serve Indonesian time in an Australian jail and vice versa."

The Denpasar District Court will hand down a verdict on May 27.

The chief prosecutor in the case, Ida Bagus Wiswantanu, said the letter was too late.

"After the hearing is closed, it's impossible to present more evidence, if it were to be submitted now, it would have no value at all according to Indonesian law."

Mr. Wiswantanu also said it appeared the Australian government was trying to influence the decision in the Corby case.

"I cannot say the Australian government is interfering, but surely whoever sent the letter will try to gain influence in the decision."

The chief judge in the case, Linton Sirait, also said the letter would make no difference to the decision on Corby, who faces life in a Bali jail if found guilty.

Meanwhile Australian Federal Police (AFP) commissioner Mick Keelty has defended his role in the case, after criticisms he had not helped Corby with his comments on the case.

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