Normally, cases assigned to the CBI are sensitive and of national importance. It is standard practice for state police departments to register cases under its jurisdiction; if necessary, the central government may transfer a case to the CBI. The agency has been criticised for its mishandling of several scams. It has also been criticized for dragging its feet investigating prominent politicians, such as P. V. Narasimha Rao, Jayalalithaa, Lalu Prasad Yadav, Mayawati and Mulayam Singh Yadav; this tactic leads to their acquittal or non-prosecution.