cross-examination vs opinion poll

cross-examination

noun
  • Any intense period of questioning, especially if hostile. 

  • The interrogation or questioning of a witness by the party against whom they have been called and examined, in an attempt to prove or reveal something false or untold during direct examination. 

opinion poll

noun
  • A poll organized in an attempt to quantify public opinion on a subject. 

How often have the words cross-examination and opinion poll occurred in a corpus of books? (source: Google Ngram Viewer )