The CBI has given a clean chit in a bribery case to former railway minister and Rashtriya Janata Dal leader Lalu Prasad Yadav, who is out on bail since April after spending more than three years in jail, sources have said. The Economic Offence Branch of CBI, as per sources, in January, 2018, had started a preliminary probe against him and real estate developer DLF Group over alleged corruption.