In many such cases wherein it was found after thorough investigation of thumb impression as well as photographs and signatures affixed by them during various processes of admission and examination were proven to be different and impersonated by different people for same candidate. Truth Labs studies revealed for applicant, one person applies for the post, someone else appears for examination and yet another person appears for interview and finally another person joins the post. Such practices of blatant impersonation and cheating were detected in hundreds of cases.