New Delhi, Apr 22: CBI today filed a chargesheet against former Union urban minister Shiela Kaul and two of her personal staff in connection with the housing scam that has rocked the country in 1990's. The chargesheet filed before special judge Prem Kumar also named Rajan S Lala, the then personal secretary to Kaul and R K Sharma, her stenographer, for entering into criminal conspiracy to make out of turn allotment of government accommodation during her tenure as Union minister. Bureau Report