A Delhi court hearing the case of missing JNU student Najeeb Ahmed on Wednesday reserved order for March 20 after it was told that a lie-detector test is illegal unless undergone voluntarily.

The court was hearing a Delhi Police plea for recording of consent or refusal of nine students to undergo polygraphy.

Vishwa Bhushan Arya, counsel for nine Jawaharlal Nehru University students who the police wanted to face polygraphy, said there was no law where a court could order the test.

He told Chief Metropolitan Magistrate Sumit Dass that as per the National Human Rights Commission, the lie detector test is not authorised by law and must be regarded as illegal unless it is voluntarily accepted.

On December 22, the Delhi High Court directed police to conduct the lie detector tests on these JNU students regarding the student who went missing in October last year.

The Crime Branch told the court that the nine students had failed to join the investigation.

Ahmed, 27, an M.Sc. First Year student, went missing allegedly after a row with members of the RSS student wing Akhil Bharatiya Vidyarthi Parishad (ABVP).

The ABVP has denied involvement in his disappearance.