“…However, in light of other studies of criminal networks, we believe that police data still remains an important and fruitful source of information to study the structure of drug operations (Natarajan, 2000(Natarajan, , 2006Morselli & Petit, 2007;Campana 2011Campana , 2016aCampana , 2016bCampana , 2018Malm & Bichler, 2011;Bright, Hughes & Chalmers, 2012;Varese, 2013;Bright, Greenhill & Levenkova, 2014;Calderoni, 2014, Framis, 2014Natarajan et al, 2015). McGloin (2005) elicited information on interactions among gang members and their associates from the experiential knowledge of police officers, and then analysed this evidence using social network analysis.…”