The agency had registered a preliminary enquiry against Mr Jain.
It is alleged that Mr Jain was involved in money laundering to the tune of Rs 4.63 crore while being a public servant during 2015-16 through Prayas Info Solutions Private Limited, Akinchan Developers Private Limited and Managalyatan Projects Private Limited, CBI sources said.
Mr Jain had dismissed the allegations after the Enforcement Directorate last month attached properties linked to him in the matter.
A preliminary enquiry is the first step by the CBI to gather information about the allegations. If the agency is convinced that there exists prima facie material in the matter, it may register a regular case against the accused.
The allegations against Mr Jain also include purported money laundering to the tune of Rs 11.78 crore during 2010-12 through these companies and Indometal Impex Pvt Limited.