Definition of dragnets:
(n) :
(law enforcement, figuratively) A heightened effort by law enforcement personnel undertaken in order to capture suspects.
(v) :
(law enforcement, figuratively, transitive) To undertake a heightened effort to catch a suspect.
(n) :
(fishing) A net dragged across the bottom of a body of water.
(v) :
(fishing, transitive) To drag a net across the bottom of a body of water.