Australia's Ambassador to Indonesia says the teenager held in Bali drug possession is under enormous stress.

The 14-year-old from New South Wales was arrested on Tuesday, accused of having about $25 worth of marijuana, 3.6 grams, on him.

He's told police he was coerced into buying the drugs by the person who sold them to him.

The case against the student may be weakened, because police broke Indonesian rules.

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The minor was interviewed again yesterday after being interrogated last week without his parents present.

The boy has spent his fifth night in custody.

Ambassador Greg Moriarty says his priority is to get the boy back to Australia.