This is not your ordinary job. ASIS recruitment pitch.

A former Australian Secret Intelligence Service officer and star witness for East Timor in a bitter dispute with the Abbott government over $40 billion in oil and gas revenue is facing criminal prosecution.

Fairfax Media has learned the Australian Federal Police sent a brief of evidence to prosecutors in February following an investigation that lasted 14 months.

The AFP investigation came at the request of the Australian Security Intelligence Organisation, the domestic spy service that raided the home of the former spy and East Timor’s Australian lawyer Bernard Collaery in December 2013.

Attorney-General George Brandis authorised the raid on “national security” grounds, saying it was a criminal offence to communicate “any information or matter” regarding ASIS, Australia’s foreign spy service.

The former ASIS spy, known as Witness K, also had his passport seized in the raids.

Without a passport, the ex-spy can’t travel to The Hague to appear for East Timor before an international arbitration tribunal which will rule on whether a treaty governing the share of oil and gas reserves in the Timor Sea should be annulled.

East Timor claims the treaty was not negotiated in good faith citing an ASIS operation to insert listening devices in the government offices of the fledgling nation in 2004. At the time, the two countries were negotiating the treaty.

Witness K led the operation where agents infiltrated East Timor under cover of an aid program to place the devices inside the wall cavities of its government palace in Dili.

Any prosecution of Witness K will be a showdown between good and evil and justice will triumph so long as our courts are able to operate

“We are facing an unprecedented attack on the Rule of Law and all that we have fought for over the years is now at stake”, Mr Collaery said

Mr Collaery argues the ASIS operation largely benefited private commercial interests, most notably Woodside Petroleum, which leads the consortium hoping to develop the lucrative Greater Sunrise oil and gas fields, he said.

The minister for foreign affairs, Alexander Downer, who ordered the ASIS eavesdropping in 2004, later worked for Woodside as a consultant. The then head of the department of foreign affairs Ashton Calvert joined the energy giant’s board after he retired. ASIS is part of the foreign affairs department.

Amid outrage from East Timor, the International Court of Justice ordered Australia to cease spying on East Timor and seal the documents and data it seized.

“ASIS employees are in our front line. They serve our national interest,” said Mr Collaery, a former ACT attorney-general who has acted for Australian security personnel for 30 years.

“ASIS staff are not there to serve private or party political interests. Witness K is an Australian hero, a veteran who drew the line at corrupt misuse of ASIS.”