Related Experiment Video
Updated: Jul 30, 2026
11:57
Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
Published on: May 20, 2013
Improved method for shooting distance estimation. Part 1. Bullet holes in clothing items
1Division of Identification and Forensic Science, Israel National Police Headquarters, Jerusalem.
Journal of Forensic Sciences
|July 29, 2000
Summary
This study presents a new method for estimating firearm discharge distance using clothing. The technique involves transferring residues to an adhesive lifter for analysis of nitrite, lead, and copper. This improves forensic ballistics investigations.
Area of Science:
- Forensic Science
- Analytical Chemistry
- Ballistics
Background:
- Accurate firearm discharge distance estimation is crucial in forensic investigations.
- Traditional methods for detecting gunshot residue (GSR) on clothing can be limited by residue transfer and degradation.
Purpose of the Study:
- To develop an improved method for estimating firing distance on clothing.
- To enhance the detection and visualization of gunshot residue components.
Main Methods:
- A novel method involving the transfer of total nitrite (nitrite ions and smokeless powder residues) from clothing to an adhesive lifter.
- Visualization of lead and copper deposits using rhodizonate and rubeanic acid, respectively.
- Application of the Modified Greiss Test after alkaline hydrolysis of residues on the adhesive lifter.
Main Results:
- Successful transfer and visualization of total nitrite, lead, and copper residues.
- The Modified Greiss Test effectively detects smokeless powder residues after alkaline hydrolysis.
- The method allows for more reliable detection of GSR components for distance determination.
Conclusions:
- The described method offers an improved approach for firing distance estimation.
- Enhanced detection of GSR components on clothing aids in forensic analysis.
- This technique contributes to more accurate ballistic evidence interpretation.
Related Concept Videos
01:05Estimation of the Physical Quantities
On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
01:15Distance Corrections
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
01:30Electronic Distance Measuring Instruments
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
01:10Design Example: Measuring Distance Between Two Points with Obstructions
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
01:17Common Leveling Mistakes and Errors
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...