Chief Metropolitan Magistrate Sumit Dass today summoned all the nine students to appear before it on April 6 in the case, where they will have to state if they are willing to undergo the test or not.
The court had on March 15 reserved its order after the counsel appearing for the students submitted that the "lie detector test is unconstitutional and illegal unless it is voluntary".
In its notice issued on January 23, the probe agency had claimed that their lie detector test was required to get information about Najeeb's whereabouts.
The notice was sent after the Delhi High Court had asked the police to explore other avenues of probe, like a polygraph test of persons connected to Najeeb, as all other leads had not yielded any result.
The RSS students' wing has denied any involvement in his disappearance.
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