a fishing expedition

a fishing expedition
a search for information without knowledge of whether such information exists. (This involves asking questions with no preconceived notion of what the answers might reveal.)
  The lawyer was on a fishing expedition. There was no real wrong committed to justify a lawsuit.
  Your honor, the prosecutor is just on a clumsy fishing expedition. I move for dismissal.
  We are going to have to go on a fishing expedition to try to find the facts.

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