How Should a Defense Team Prepare Demonstrative Evidence?
A diagram, timeline or animation can make testimony clear. It can’t prove more than the testimony behind it, and in Texas it has to clear Pugh first.
Mr. Heath Enix ‘Heath’ Hyde
Eligible to Practice in Texas
Attorney at Law
Bar Card Number: 00796807
TX License Date: 11/01/1996
Primary Practice Location: Dallas, Texas
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Short answer
A demonstrative can show jurors what a witness’s testimony looks like on a diagram, a timeline or a screen. It can’t prove anything that testimony doesn’t. So your lawyer ties every label to a source, lines up a witness to vouch for it, and gets a ruling before the jury sees anything contested.
| What the other side may say | What the exhibit may actually show |
|---|---|
| “That animation proves how it happened.” | An illustration of one expert’s testimony |
| “The diagram is to scale.” | A hallway drawn at 30 feet that measures 18 |
| “It’s just a summary chart.” | A demonstrative, unless the records are voluminous |
| “It doesn’t show our version.” | It needn’t, if it’s accurate to its own evidence |
What to do now: If anyone in the family has photos or video of the scene from before the incident, give the original files to the lawyer, with the date each was taken.
What does Texas require before jurors see a demonstrative?
In Pugh v. State (Tex. Crim. App. 2022), the State showed jurors computer animations of a truck striking a pedestrian. The Court of Criminal Appeals upheld them. The opinion is now the leading Texas case on demonstratives.
| Requirement | What Pugh held |
|---|---|
| Authentication | A witness shows it fairly and accurately represents what it depicts, or the expert’s opinion. |
| Relevance | It helps jurors understand other admitted evidence, with no force beyond the witness’s credibility. |
| Rule 403 | Inaccuracies, scale changes and distorted perspective are weighed against how much it helps. |
| Expert foundation | An animation of expert testimony must rest on reliable testimony under Rule 702. |
| Contested facts | It needn’t reflect the other side’s version if it accurately reflects the evidence it illustrates. |
A demonstrative isn’t independent proof, so the witness behind it matters more than the graphics. A hand-drawn scene diagram illustrates a witness’s description of a room or street. A timeline of phone records illustrates admitted records, or it may be offered as a Rule 1006 summary. A 3-D animation of a shooting illustrates an expert’s reconstruction, and it needs a reliable expert behind it.
How should the team check accuracy?
The investigator’s tape measure reads 18 feet down the hallway. The draft diagram makes it look like 30. An outside check catches that before the jury does.
| Check | What can go wrong |
|---|---|
| Scale | A hallway drawn at 30 feet that measures 18 |
| Perspective | An overhead view showing what no witness could see |
| Timing | UTC phone records converted wrong, putting a call an hour off |
| Labels | An estimate marked “measured” |
| Assumptions | A shooter’s height and stance nobody described |
Label anything not to scale, mark estimates as estimates, and show a disputed fact as disputed.
One line of a source sheet might read “Front door to couch: 14 ft.” The source column cites the crime-scene investigator’s measurements, page 3. The witness column names the defense investigator who checked it with a laser measure on May 9.
That sheet goes with the witness to the stand. On cross, she can point to the line behind any number.
When does a chart become evidence on its own?
The phone company produced 4,000 rows of call-detail records. Only 12 calls matter. A chart that proves the content of a record set that large falls under a separate rule.
Under TRE 1006, a summary, chart or calculation can prove the content of voluminous writings, recordings or photographs that can’t be conveniently examined in court. The proponent must make the originals or duplicates available to the other side at a reasonable time and place. The court may also order the originals produced in court.
Calling a slide a “summary” doesn’t make it one.
| Slide | Likely treatment |
|---|---|
| A: 4,000 call rows cut to the 12 that matter; full records given to the State in March | May qualify as a Rule 1006 summary |
| B: six texts already admitted as Exhibit 41 | More likely a demonstrative |
What rulings and records does the defense need?
Your lawyer cues up the scene animation and the prosecutor is already on his feet. The jury files out while frame 212 sits paused on the screen.
| Rule | What it gives the court or the defense |
|---|---|
| TRE 104(a) | The judge decides preliminary admissibility questions. |
| TRE 105(a) | A limiting instruction, on request, for a one-purpose exhibit |
| TRE 403 | Exclusion when unfair prejudice, confusion or misleading the jury substantially outweighs value |
| TRE 611(a) | Court control over the mode and order of presenting evidence |
| TRE 103(a) | Error preserved by a timely, specific objection or an offer of proof |
Pugh held the judge doesn’t have to give a limiting instruction for a demonstrative on its own. A party has to ask. If the judge excludes the defense’s animation, Rule 103(c) lets counsel make an offer of proof outside the jury’s presence and before the charge is read.
The appellate record has to show what jurors saw. So the team keeps the exact file or board shown, every earlier version, the source sheet, and a tested backup on a second device.
What can a family do while exhibits are being built?
Maybe your sister took photos of the apartment the week before the shooting. Maybe your father remembers where the couch sat before the landlord moved it.
Find the original photos and videos of the scene, with dates, and any floor plan, lease or listing that shows the layout. Note furniture or fixtures that changed later. Don’t post homemade diagrams. Give the lawyer the original files, not edited copies.
Frequently asked questions
Can the State use an animation against the defendant?
If it’s authenticated, relevant and passes Rule 403, as in Pugh, it can come in, and the defense can challenge its accuracy and expert basis.
Does a demonstrative go back to the jury room?
Not necessarily. It depends on how the court admits it, so counsel should ask.
Should the defense share its exhibits before trial?
Sometimes. It depends on the exhibit, the court’s orders and strategy, and your lawyer decides that timing.
Can a visual adopt the defense’s version of disputed facts?
Pugh says a visual must accurately reflect the evidence it illustrates, not the opponent’s account.
Talk with Heath Hyde
A clear exhibit can help jurors follow complicated evidence, but it has to rest on solid proof. Call Heath Hyde, P.C. at 903.439.0000 or request a free consultation. You can also read about preserving and testing an alibi, what the State must prove in a Texas murder case, and the Texas Murder Trial Defense Knowledge Hub.
Legal sources
- Pugh v. State, No. PD-1053-19 (Tex. Crim. App. 2022)
- Tex. R. Evid. 103–105, 401–403, 611, 702, 901, 1006
This article provides general educational information, not legal advice. Every case depends on its facts, evidence, court, deadlines and governing law. Past results do not guarantee a similar outcome.
