New Delhi: A witness in the 2008 cash-for- vote case on Wednesday told a Delhi court that city police was adopting "double standards" and giving a green signal to Rajya Sabha MP Amar Singh that he would be let off in the scam matter.

Hasmat Ali, who claimed that the cash scam hinges on his testimony as a witness, has sought the court's direction for registration of an FIR against Singh alleging he was kidnapped on September 25, 2008, the scheduled day of his deposition before the Parliamentary inquiry committee probing the scam.

"Police is giving a green signal to Amar Singh that they are not believing my statement (of being kidnapped) and so he (Singh) will be discharged in the cashscam," Ali's counsel L K Verma told Metropolitan Magistrate Sudesh Kumar.

The magisterial court reserved its order for December 12 on the complaint of Ali who is seeking registration of the FIR against Singh and two others.

Police was relying on his statement in the cash-for-vote case and simultaneously, it was disbelieving his complaint that he was kidnapped, Ali's lawyer said.

He said that crime branch has given a clean chit to Singh, his secretary Tarun Goel and aide Ramesh Kumar for their role in kidnapping his client whereas they are "solely relying" on Ali's statement in the cash-for-vote case.

"Crime branch of Delhi police is accepting all my (Ali) statement in the cash-for-vote case but here they say there was no kidnapping. It is simply double standards. Have they interrogated any person? Whether Amar Singh was interrogated?.

"Prima facie, a case of kidnapping is made out and it has to be thoroughly probed and accused (Singh, Goel and Kumar) have to be interrogated. I pray that police be directed to register an FIR," he said.