While dealing with a hard-core criminals, the police apply some methods that catch the criminals off guard. For example, one police officer asks a particular criminal some causal questions and notes them down, and then another officer comes in as a cross-questioner or cross-examiner asking the same questions and cross-checking the answers the criminal has given earlier.

Betty said she was innocent and did not have anything to do with the murder or the theft in her office; however, she was cross-questioned by several cross-questioners from different departments, including her own boss, and  was finally declared innocent!

In a court case, when a trial is in session, the judge allows the lawyers to cross-examine the witnesses, and when a cross-examiner starts to cross-examine the witness, the judge watches over to see if a particular witness has made any false statements this time or earlier.