The First 15 Minutes of an Investigation Can Determine the Outcome

When an incident happens, our attention turns to emergency scene management: helping injured workers and making the area safe. That’s exactly as it should be. But once the emergency is under control, something else begins happening: evidence starts disappearing.

The Priority of Emergency Scene Management

Collecting the facts is important, but no photograph, measurement, or sample is worth putting another person at risk. The priority in emergency scene management is always to ensure the scene is safe before anyone begins documenting or collecting anything. Once hazards are identified and controlled, investigators can begin preserving the remaining information.

Every Change Tells a Different Story

Imagine a maintenance incident involving a steam release.

Coworkers rush in to help. Emergency responders isolate equipment. Tools are moved out of the way. Someone throws away a pair of contaminated gloves.

Each action is necessary, but each action also changes the evidence.

Later, investigators may wonder:

• Where was that wrench originally?
• Who moved the valve?
• Whose gloves were found in the trash?
• Is the information that remains part of the incident, or part of the emergency response?

Those questions become much harder to answer after the scene has changed due to emergency scene management.

After Emergency Scene Management, Preserve Before You Analyze

Don’t fall into the trap of trying to explain the incident too soon. A better approach in those first fifteen minutes of an investigation is to preserve what you can while it’s still there. Be aware that the scene has changed due to emergency scene management. Take photographs before anything else changes. Record equipment positions. Document environmental conditions. Limit unnecessary access to the area. Keep track of what was moved and why.

Better Evidence Leads to Better Improvements

When we protect the evidence, we protect our ability to learn. Every piece of evidence that we lose is one less opportunity to understand what happened. A thoughtful approach to the investigation after emergency scene management gives investigators the best chance of identifying the real causes and preventing the next incident.

Coming Soon

This article is adapted from the upcoming second edition of Evidence Collection and Interviewing Techniques to Sharpen Investigation Skills by Barb Carr and Mark Paradies. The revised edition, scheduled for release in early 2027, expands on practical methods for collecting reliable evidence, conducting effective interviews, and strengthening investigations through sound investigative practices.

Want to know more? Consider joining us for the Effective Interviewing and Evidence Collection course at the 2027 Global TapRooT® Summit. You’ll receive a copy of the new book and improve your information collection skills.