Truant patients are turning out to be a major impediment to leprosy treatment in the Capital. More than half the people being treated free for leprosy under the Delhi state government programme are migrants. This has become a problem, as many leave the treatment mid-way to head back home, thinking that they are cured fully. But the truth is far from it. "People from states such as Jharkhand, Bihar and Uttar Pradesh come to Delhi for treatment because of the stigma attached back home. It is very difficult to trace the migrant patient population as they leave the city as soon as they start seeing positive health results.