U.S. flag

An official website of the United States government

Government Website

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Safely connect using HTTPS

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


  1. Home
  2. News
  3. Publication Library
  4. Pumice Residual-Odor Material Non-Detonable Canine Motivation Aids

Pumice Residual-Odor Material Non-Detonable Canine Motivation Aids


A process to create disposable scent training aids by trapping explosive vapor molecules in pumice.

Working dogs trained for scent detection can identify trace levels of explosives and target substances but require consistent practice to maintain their on-command detection abilities. Trainers often use real explosives and substances, which involve bulky stationary equipment, limited location options, and exposure risks. When handling training materials, there is also a potential for cross-contamination or ineffective odor release. Disposing of the materials can also be challenging if they are not environmentally benign, non-detonable, or safe for regular disposal.

To eliminate these challenges, researchers at the Transportation Security Administration (TSA) invented the Pumice Residual-Odor Material (PROM) Non-Detonable Canine Motivation Aid. PROM is made by heating the explosive sample within a vacuum and trapping the vapor produced in a pumice stone. The resulting pumice contains trace substances to mimic a real-world scenario but is safe to handle and non-detonable. Once the training aid expires, it can be safely disposed of in regular waste receptacles.

Technology Category Transportation Security & Explosives Characterization
Stage of Development Prototype
Inventor(s) Inho Cho
US Patent number US11,498,882; US11,802,091 
Partnerships Sought License
DHS Component Transportation Security Administration
Contact Information T2C@hq.dhs.gov

For a more detailed description download the PDF below.

Attachment Ext. Size Date
Pumice Residual-Odor Material Non-Detonable Canine Motivation Aids PDF 645.65 KB 07/05/2024
Last Updated: 07/08/2024
Was this page helpful?
This page was not helpful because the content