- Types of Computer-assisted
- Models visualize how an
object (car, machine etc) looks from actual data
used to construct the real thing. Your data can
be obtained from blueprints, CAD files,
photographs, and testimony from expert/lay/eye
witnesses intimately familiar with the real
- Demonstrations show how a
physical principle really works. You may need to
explain the inner workings of a machine;
however, you are not illustrating the expert's
opinion in a case; it is just a tutorial showing
background information jurors need to understand
the expert's opinion. Demonstrations must
conform to the relevant laws of physics,
chemistry, biology etc.
- Event Sequence
Reconstructions a.k.a. Telling a
Story show how events at issue happened. You may
need both the expert witness and the
artist/producer of the animation to lay proper
- Simulations a.k.a. Actual
Re-enactments have the forensic expert/engineer
using specially written software to
"re-create" an event or simulate
reality inside a computer. The resulting
animated re-enactment or diagram is a
representation of calculations (speed and weight
of the car, road conditions, financial
forecasting) that have taken place inside the
computer. Your expert must be able to say under
Rule 703 that the software is the type used by
experts in this field and Rule 901(b)(9).
Lay Your Foundations for
- Qualify Your Expert
Witness under Rule 901(b)(9); your expert must
be able to support the reasonable use of their
data in the animation; the animation artist must
be prepared to testify that the system/software
used to produce the animation produces fair and
- Qualify Your Computer
Hardware & Software; you must be able to
show the commercial, non-litigation, analytical
applications of the software/hardware used to
produce the animation.
- Qualify Your Data; the
data used to construct animated models,
demonstrations, or reconstructions (e.g. expert
witness calculations, models, or opinions; lay
"eye" witness testimony; physical
measurements, photographs, CAD or blueprint
drawings or technical documents, data recorders)
must be identified and verified. The source of
this data must be identified; hard copy of this
data could required in court.
- Input Quality Check; a
witness should be able to describe the details
and methods employed to input (3) data into both
the expert's and animator's computer; accuracy
checks should be verified.
- Your Expert Witnesses
should be able to identify and defend their
assumptions of what and how something happened.
- Qualify Your
Presentation/Display Media; your presentation
media (e.g hard-drive, CD-ROM, videotape shown
on a tv monitor, digital video projector etc)
must show the computer-originated animation
accurately (e.g. color, etc).
Click below to navigate
All contents Copyright © 1997-2003, Visual Evidence Center Inc.
All Rights Reserved.