"It is a simple case of assets which are disproportionate to the known sources of income and Rabri Devi, who has been a simple housewife, will be hard-pressed to explain it," says one IT official. Emboldened by the CBI's stand, IT officials are probing leads on other investments made by Laloo in Bangalore, Delhi and Mumbai. A probe has been launched on Laloo's brothers-in-law—Subhash Yadav and Sadhu Yadav, whose IT returns for 1996-97, according to insiders, are unsatisfactory. But despite the aggressive posture, the IT department is yet to raid Laloo's houses; Laloo and Rabri haven't yet been served summons for personal appearance; and it has made no attempts to seal her bank lockers. Says Vijay Sharma, deputy director (investigations), Patna: "These are extremely sensitive cases. One has to tread with a lot of caution."