Benami Properties of Lalu Prasad And Rabri Devi Attached Following Raids

http://www.business-standard.com/article/current-affairs/full-list-benami-properties-of-lalu-prasad-relatives-seized-by-i-t-dept-117062000700_1.html - this is serious stuff.

How did IT or CBI or whoever identify Lalu as a potential raidee?