The cases were being investigated by the economic offences unit (EOU) of the Bihar Police.
Bihar Chief Minister Nitish Kumar had recommended a CBI probe into the case.
Sources said the CBI has received the reference from the Centre to take over the investigation.
They said the agency received the necessary documents from the Bihar government today.
The state police had issued a lookout notice against Priya Kumar, the secretary of the NGO Srijan Mahila Sahyog Samiti, and her husband Amit.
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