"The bail application is dismissed," Chief Metropolitan Magistrate (CMM) Amit Bansal said.
Dabas had moved the court seeking bail, saying there was no direct evidence against him and he was falsely implicated in the case by the police. He had alleged that he had become a "victim of the system".
He was arrested on February 14 for allegedly trying to access Jaitley's call details. According to police, Dabas had used the official email ID of an Assistant Commissioner of Police to send a request to a mobile service provider for the call detail records of the BJP leader.
The police, on the other hand, had opposed his bail plea and had argued that offences of forgery under IPC may be made out against the four accused including Dabas which were non- bailable and the constable should not be granted relief.
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Besides Dabas, three private detectives -- Anurag, who is alleged to be the main conspirator, Neeraj and Nitish -- have also been arrested and all of them are in judicial custody till March 20.
During the arguments held in-camera on the bail plea, the police had said that offences under sections 464 (making a false document), 468 (forgery for the purpose of cheating) and 471 (using as genuine a forged document) of the IPC may be made out against the accused in the case.
The police had also said that the chain of events in the case was "complete" which showed "criminality" on the part of the accused and the investigation in the case was still on. According to the police, Dabas was the first to be arrested followed by the others.