Impeachment|Issue 1 Defendant is on test for armed break-in. Defendant is looking for to impeach Witness with an inconsistent reality, or else understood as impeachment by opposition. Proof regulation allows this kind of impeachment since a witnesss valid mistakes often tend to threaten the reputation of the valid witness, which is undoubtedly crucial at tests, which exist to settle questioned facts.But the cross-examiner could not recommend an inconsistent truth unless she has a good-faith idea that the inconsistent truth exists.