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((More citations needed|date=January 2008))
((Evidence law))
'''Demonstrative evidence''' is evidence in the form of a [[Depiction|representation]] of an object.  This is, as opposed to, [[real evidence]], [[testimony]], or other forms of [[evidence]] used at [[trial]].

==Examples==
Examples of demonstrative evidence include [[Photography|photos]], [[x-rays]], [[Videography|videotapes]], [[movies]], [[sound recordings]], diagrams, [[forensic animation]], [[map]]s, [[drawing]]s, [[graphics|graphs]], [[animation]], [[simulations]], and models.  It is useful for assisting a [[finder of fact]] (fact-finder) in establishing context among the facts presented in a case.  To be admissible, a demonstrative exhibit must “fairly and accurately” represent the real object at the relevant time. See [[Federal Rules of Evidence]] 901, 902, and 1001-1004 for an example from United States law.

Other examples of demonstrative evidence include case specific medical exhibits, colorized diagnostic films, general anatomy and surgery exhibits.  These forms of demonstrative evidence are commonly used as a personal injury lawyer resource. Demonstrative evidence with dramatic impact can maximize the value of a case by effectively depicting catastrophic/traumatic injuries, complex surgical procedures, surgical mistakes or summarize injuries suffered by an individual.  These examples of demonstrative evidence are used for settlement conferences, arbitration, mediation, medical expert depositions and trial presentations.

Demonstrative evidence is an effective aid in infringement litigation.

Whether prosecuting an infringer or defending a patent, originally filled patent drawings which are a part of most patent applications, can play an imperative part in any upcoming litigation.
If the original patent drawings are not complete, accurate and exact, then the resulting output for litigation graphics is unreliable and could even hurt a case.

There are many ways to convert patent drawings into effective litigation graphics.
Here are a few ways:

A patent drawing can be made visually transparent and overplayed onto an opposing image to show likeness or differences.

Color can be applied to elements of the original patent drawings and the same colors on similar elements of an opposing images to highlight likeness.

A front view from the application can be placed alongside a front view of the opposing invention with additions outlined in color to emphasize differences

A process flow chart from a utility patent application can be used alongside a flow chart of the opposing party with an insert between the two to indicate differences or similarities in process.

Callout information on a patent drawing can clarify key elements of the invention and emphasize important features.

Drawings from a patent application can be used in PowerPoint to create a simple tutorial using animation with color arrows, overlays and voice over to explain an invention.

Original patent drawings can be used as a basis to create complex 3D animations.  Operation, technical procedures, incompatibilities between inventions and moving parts of an invention can be clearly presented. Furthermore, animations can indicate time, motion or speed, compare alternative theories or simplify highly complex data.

There are endless ways to manipulate original patent drawings to make compelling litigation graphics, each circumstance unique based on the setting, the invention, the desired outcome and budget.

Using original patent drawings as a starting point can save cost of having to start from scratch.

In many patent lawsuits filed, a substantial amount is spent on demonstrative evidence. 
WIPO Magazine stated, “according to a recent study by PricewaterhouseCoopers over 5,000 patent lawsuits – an all-time record – were filed, each costing on average around US$2.8 million.”  Those numbers are for 2012; it is unlikely that costs have come down.

See the following link for WIPO article “What Place for Patent Drawings”
[http://www.wipo.int/wipo_magazine/en/2014/03/article_0005.html IP Litigation: What Place for Patent Drawings?]

==History==
Before photographs and other demonstrative evidence, [[lawyer]]s relied on purely testimonial or substantive evidence.  [[Melvin Belli]] and [[Earl Rogers]] helped change that by introducing more demonstrative evidence.((Citation needed|date=January 2008)) Scientific evidence emerged in the 1960s.((Citation needed|date=May 2007))

==Mechanics of use==
((Unreferenced section|date=January 2008))
In American [[jurisprudence]], demonstrative evidence, like any other kind of [[evidence]] must be [[wikt:relevant|relevant]].  At this point the proponent of the demonstrative evidence can either try to get the evidence admitted into the official record of the case or can choose to use the evidence as merely a prop.  If the proponent of the evidence wants to have the evidence included in the official record of the case, the proponent will first ask for the evidence to be marked by the court for identification purposes.  After the evidence is marked for identification, the proponent of the demonstrative evidence must [[lay a foundation]].  It is at this time that the relevancy of the demonstrative evidence is usually challenged.  Laying of a foundation explains how the demonstrative evidence relates to the facts of the case and establishes the evidence's authenticity.  Once the foundation is laid, the proponent may ask to officially move the piece of evidence into the record where it is marked as a full exhibit.  If the evidence is marked as a full exhibit the jury may refer to the evidence during deliberations and in most jurisdictions the jury may examine the evidence during deliberations.  If the evidence is not marked as a full exhibit, the jury cannot do these things.  As a matter of courtesy, the proponent of the demonstrative evidence generally shows the piece of evidence to the opposing party before marking it for identification purposes.  In criminal cases certain kinds of demonstrative evidence are subject to mandatory disclosure under the case law governing [[Discovery (law)|discovery]].  See [[Brady v. Maryland]]. While the law distinguishes between illustrative and substantive demonstratives, and jurors note this difference, jurors award damages regardless of the evidentiary status of demonstratives <ref>((Cite web |last=Kellermann |first=Kathy |date=July 1, 2022 |title=Do jurors distinguish illustrative and substantive demonstratives when awarding damages? Online Jury Research Update |url=https://kkcomcon.com/OJRU/ROJR0722-1.htm |access-date=July 30, 2023 |website=ComCon Kathy Kellermann Communicatio Consulting))</ref>

==Popular culture==
Examples of demonstrative evidence from popular culture include their use in these motion pictures:

* ''[[The Rainmaker (1997 film)|The Rainmaker]]'' - use of a plaque to show the number of claims filed and accepted
* ''[[Erin Brockovich (film)|Erin Brockovich]]'' - charts and files
* ''[[A Few Good Men (film)|A Few Good Men]]'' - logs and photographs
* ''[[My Cousin Vinny]]'' - photographs, tape measure

== References ==
((Reflist))
* Ronald J. Rychlak, ''Real and Demonstrative Evidence: Applications and Theory'' (Lexis-Nexis, 2nd ed. 2002)

==External links==
* [http://www.isp.state.il.us/media/let0903fda.cfm Spotlight on Illinois State Police Forensic Diagramming & Animation]

((DEFAULTSORT:Demonstrative Evidence))
[[Category:Evidence law]]
[[Category:Lawsuits]]
[[Category:Judiciaries]]

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