Gunshot residue on hands can be detected by:
**Core Concept**
Gunshot residue (GSR) detection on hands is a forensic technique used to identify individuals who have recently fired a firearm. This is achieved by analyzing the chemical composition of the residue, which contains particles from the primer and propellant used in ammunition.
**Why the Correct Answer is Right**
The correct answer involves the use of a chemical test, specifically the gunshot residue (GSR) test. This test detects the presence of nitrates and other compounds found in the primer and propellant of ammunition. The test is typically performed using a swab or wipe to collect samples from the individual's hands, which are then analyzed using techniques such as chromatography or spectroscopy. The presence of these compounds on an individual's hands can indicate that they have recently fired a firearm.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a valid method for detecting GSR on hands. While DNA analysis can be used in forensic science, it is not a direct method for detecting GSR.
**Option B:** This option is incorrect because it does not accurately describe a method for detecting GSR on hands. While toxicology tests can be used to detect the presence of certain substances, they are not typically used to detect GSR.
**Option C:** This option is incorrect because it does not accurately describe a method for detecting GSR on hands. While microscopy can be used to examine the physical characteristics of GSR, it is not typically used to detect the chemical composition of GSR.
**Clinical Pearl / High-Yield Fact**
It is essential to note that GSR can be transferred from one individual to another through contact, which can lead to false positives. Therefore, forensic examiners must carefully collect and analyze samples to ensure accurate results.
**Correct Answer:** C. Chemistry test.