Demonstratives are helpful in direct examination and cross examination. If you prepare well you can use your own charts/photos with an expert. If you prepare well, you can have the expert fill in the missing information in his own chart. If you are prepared, you can use contradictory theses, books, illustrations in a leading manner, after locking the witness in to their authenticity and authority.
- If a witness is adverse enough to your position that you are asking leading questions, the demonstrative should also be used in a leading fashion. Great care must be taken to avoid the temptation of then asking, “So how was this used?” or something of the kind.