US women

The woman, who has not been identified, arrived in Sydney from Los Angeles and did not have a permit for the firearm, the Australian Border Force (ABF) said.

She could face up to 10 years in jail.

Photos released by the ABF showed an airport scan of the woman's luggage, revealing the firearm inside her bag. A second photo showed the handgun after the bag was opened.

In a statement, an ABF official said that sophisticated detection technology had helped stop a dangerous weapon from entering the country.

But the case has raised questions about whether these women have been exploited, or empowered, by this enterprise.

What happened in Cambodia?

For the past two years, dozens of women have been supplying their excess breast milk to a company called Ambrosia Labs.

The company has been processing and selling the milk in the US. It was marketed at US mothers who have problems producing milk for their babies.

On Tuesday, Cambodia imposed an immediate ban on breast milk exports, effectively ending the business.