Samples can be taken from food joints even without a complaint.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/food-safety-act-takes-effect-northern-tamil-nadu
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-safety
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-safety-and-standards-act-2006