Formed in 2012, Police Bureau of Investigation (PBI) has earned a reputation for solving the seemingly unsolvable, "sensational" and difficult cases. This specialised unit conducts criminal investigations and digital forensic services by the order of court and Police Headquarters (PHQ). In an interview with The Daily Star, PBI chief, Deputy Inspector General (DIG) Banaj Kumar Majumder spoke about the organisation's work process, achievements, challenges, constraints and future plans. The Daily Star (DS): How did PBI start its journey? Banaj Kumar: The National Integrity Strategy formulated by the government referred for an independent investigation body to deal with cases. Besides, the demand for such a unit was also raised from the court, which eventually gave shape to PBI. Set up in 2012, PBI started investigating cases from 2015.