If the certificates were found to be bogus, the candidates would be barred from admissions for three years.
In another case, a candidate from Andhra Pradesh was asked to bring a certificate with the signature of the Village Administrative Officer (VAO). When officials questioned him about the authenticity of the signature, he started evading their queries and, finally, ran away leaving the certificate.
Dr. Uthariaraj said there could be many cases of students from other States occupying seats for Tamil Nadu students.
Another means of cheating seemed to be old students producing school leaving certificates and taking up seats even when they were already in college. "This could be to block the seats in the counselling process and make students go in for management seats later," Dr. Uthariaraj said.
In all, 496 students, who passed out between 2007 and 2009, had applied and two cases had been brought to light in which the students had produced only the school leaving certificate.
The authorities are now insisting that the candidates bring transfer certificates from their college.
Asked about similar incidents in previous years, Dr. Uthariaraj said such cases had not been detected. But, the scrutiny process had also been made more stringent this year after the first such cases were detected.
Counterfeit Certificates emerge at Engineering Admissions