Young women travelling overseas are warned to stay vigilant because of the growing human trafficking industry.
Daniel Walker is a former detective for the New Zealand police and founder of Nvader, an organisation that works towards the release of enslaved women and children.
He says some young women travelling overseas are at risk of capture after being drugged or lured by promises of money and fame.
The Nvader organisation estimates more than two million children a year are sold into slavery and brothels.
He says he has been offered children as young as 6 while working undercover.
The global market value of the underground crime circuit is US$32 billion, according to United Nations figures provided by Nvader.
Experts pose as clients to gain entry to brothels in predominantly South-East Asia. Hidden cameras film the exchanges and the experts gather information with the hope of prosecuting, Mr Walker says.
"This form of slavery occurs because it occurs in secret."
Speaking to young women at New Zealand schools helps spread the message, he says.
Mr Walker visited Westlake Girls' High School on March 4 to share the organisation's success story.
Twenty-four women and children have been saved by Nvader since January, he says.
Nvader has partnered with TearFund to raise money to fight trafficking.
The 120 kilometre Poverty Cycle event, on August 30, will raise money to go towards freeing women and children.
Go to povertycycle.org.nz or call 0800 800 777 for more information.
North Shore Times