The idea of using X-ray to stop underage girls from getting into the trade is being conducted across West Bengal by Durbar Mahila Samanwaya Committee, a sex workers' organisation with around 1.30 lakh members.
"We don't want teenagers and adolescent girls to enter this trade. But at times agents, and even parents of poor families, try to present underage girls as above 18 years," said Mahashweta, a senior official of Durbar.
"By conducting an X-Ray of wrist and waist, the age of a woman can be easily determined. It is the easiest way and has been in practice in western nations to prevent underage girls from entering flesh trade," said Samarjit Jana, principal of Sonagachi Research and Training Institute (SRTI), an NGO which works with Durbar.
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Asia's largest red light zone, Sonagachi in the city, is the first to roll out such an initiative.
Durbar officials said they have started a campaign, with the help of state government, against adolescent girls being pushed into sex trade.
Besides Kolkata, the campaign has gained momentum in districts like Coochbehar, Jalpaiguri, Malda, North 24 Parganas, South 24 Parganas and Murshidabad, where flesh trade and women trafficking are rampant.
"When we see a new teenaged girl in the trade, we question her. We ask her age, whether she has come on her own, whether she knows what she will be asked to do, etc," another Durbar official said.
To make the process more effective, a self regulatory board has been set up in Coochbehar, Jalpaiguri, and some other bordering areas, with a public representative heading it. The board has two sex workers, the chief district medical officer, a doctor, a lawyer and a social worker.