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Drug companies are facing mounting pressure to investigate reports that new medicines are being tested on some of the poorest people in India without their knowledge. "We were surprised," Nitu Sodey recalls about taking her mother-in-law Chandrakala Bai to Maharaja Yeshwantrao Hospital in Indore in May 2009. "We are low caste people and normally when we go to the hospital we are given a five rupee voucher, but the doctor said he would give us a foreign drug costing 125,000 rupees (£1,400)."