Legal grasping at straws; the use of pretrial investigation discovery or witness questioning in an unfocused attempt to uncover damaging evidence to be used against an adversary. Found on http://www.nolo.com/dictionary/fishing-expedition-term.html
a legal proceeding mainly for the purpose of interrogating an adversary, or of examining his or her property and documents, in order to gain useful information. · any inquiry carried on without any clearly defined plan or purpose in the hope of discovering useful information. Also called Found on https://www.infoplease.com/dictionary/fishing-expedition