CBI had registered a preliminary enquiry against Jain in April. The Delhi minister is alleged to be involved in money laundering to the tune of Rs 4.63 crore while he was a public servant in 2015-16.
Jain has dismissed any wrongdoing after the Enforcement Directorate (ED) attached properties linked to him in the matter last month.
A preliminary enquiry is the first step by the CBI to gather information about allegations. If the agency is convinced that there exists prima facie material in the matter, it may register a regular case against the accused.
Allegations against Jain also include purported money laundering to the tune of Rs 11.78 crore during between 2010 and 2012.