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Prosecutors have asked Essex Police to obtain more evidence over allegations that Energy Secretary Chris Huhne dodged a speeding penalty.
The CPS said it had requested additional material after completing a "full review" of the case.
"We have now considered all the evidence submitted to us so far and have completed a full review of the case," a spokeswoman said.
"We have asked Essex Police to obtain further information which they are seeking to gather.
"As a result, this week they were granted a production order for material held by a national newspaper.
"We await the outcome of this. We continue to work closely with the police and hope to reach a decision shortly."
Police began investigating more than five months ago after claims emerged that Mr Huhne asked his ex-wife, Vicky Pryce, to accept penalty points on his behalf.
The force delivered an initial evidence file to the CPS in July, but has since been pursuing other leads.
The speeding offence is alleged to have taken place in 2003 when the then-MEP was driving home from Stansted Airport after flying back from the European Parliament.
Liberal Democrat Mr Huhne has denied the allegations and said he hopes the probe will "draw a line'"under the furore.