Matrimonial detective agencies are booming as more young Indians choose love matches over arranged marriage
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Indian weddings are big business, and families are happy to spend on detectives to check prospective partners
Detectives use a range of high-tech gadgets to snoop on their subjects
Spy cameras can be disguised as shirt buttons
Sleuth Sanjay Singh says his business provides a 'service to society'
From an anonymous office in a New Delhi mall, matrimonial detective Bhavna Paliwal runs the rule over prospective husbands and wives -- a boom…