Central Bureau of Investigation (CBI) questioned BRS leader K Kavitha in Tihar jail, linking to a money laundering case related to the Delhi excise policy scam.
The agency was permitted by the special court to question her on the WhatsApp chats recovered from co-accused Buchi Babu's phone and documents related to a land deal after which ₹100 crores was allegedly paid to AAP in kickbacks to swing excise policy in favour of a liquor lobby.
The agency officials had gone to Tihar Jail on Saturday where she was questioned on these aspects of the case, the sources said.
The court's permission was mandatory to question her in Tihar jail because she was in judicial custody.
Kavitha, daughter of former Telangana chief minister K Chandrashekar Rao, has been accused of being a key member of the "South Group", which allegedly paid the ruling AAP in Delhi kickbacks of Rs 100 crore in return for a big share of liquor licences in the national capital. She was sent to 14-day judicial custody last Tuesday.
The ED had arrested Kavitha, 46, from her Banjara Hills residence in Hyderabad on March 15.
The special court on Tuesday extended her custody till April 23 after she was produced before the court on the expiry of her judicial remand granted earlier.