Patna: The police arrested at least 30 people allegedly for attempting irregularities in the NEET-UG re-examination in Bihar, an officer said on Monday.While 18 people working in the exam centres were arrested for violating the biometric verification norms, the majority of the others were impersonators who tried to write the exam in place of the genuine candidates. The re-examination was conducted across the state on Sunday amid tight security after the original undergraduate medical entrance test, held in early May, was cancelled amid widespread allegations of a question paper leak.According to a statement issued by Lakhisarai police, nine impersonators, a genuine candidate, and two associates were also apprehended.