Central Bureau of Investigation today conducted searches at several places in Lucknow in connection with alleged irregularities in Public Distribution System (PDS) in the state. The CBI sources said, searches were conducted at 12 locations in Lucknow at the premises of some state food corporation employees and alleged middlemen. The CBI has been investigating a case related to alleged food scam in the state in which PDS grain meant for the weaker sections of society was diverted to be sold in black market.