Quark engages in a variety of shady deals, but neither Sisko nor Odo, Quark's nominal nemesis and head of station security, take serious action against him, partially because his value outweighs his numerous illegal activities, which for the most part, harm no one. Furthermore, the station's status as, technically, the property of Bajor and thus only nominally a Federation station, sometimes prevented Sisko from prosecuting Quark to the full extent of Federation law; Sisko was not allowed such latitude with criminals who were also Federation citizens, such as his own lover, Kasidy Yates, whom Sisko was once obliged to arrest for dealing in illicit replicators yet, on the same occasion, obliged to allow Quark relative amnesty for dealing in illicit "weapons". In the episode "", Sisko admits that he had "cut a "lot" of slack in the past [and even looked away once or twice when could have come down hard." However, Sisko's leniency does not stop Odo from regularly interfering with Quark's illegal doings. A shrewd businessman, Quark often quotes the Ferengi Rules of Acquisition.