Few people in the slums of Ahmedabad, India, know more about the supply of human guinea pigs for clinical drug trials than Rajesh Nadia.

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When Indian firms working for pharmaceutical companies need test subjects, they often turn to Nadia, who has carved a small niche for himself as a recruiter in the international drug-testing industry.

“Companies call me or send me text messages,” he told “Dateline NBC” correspondent Chris Hansen.

Self-confident and well-groomed with gelled hair and tight-fitting designer jeans, Nadia said he is paid about $12 for every recruit he brings to the three Indian research labs with whom he works. In a region of western Indian where the average worker earns 50 cents a day, that’s good money.

Risks minimized?