Which of the following statements is true of firearm residues?
A. The paraffin test for detecting firearm residues distinguishes between nitrates of gunpowder origin and those from other sources.
B. Determining whether an individual fired a gun is primarily based on absolute quantities of primer residue on the hands.
C. When a handgun is discharged, discrete particulate matter containing barium and lead are deposited on the thumb and the forefinger.
D. If a person has discharged a handgun, firearm discharge residues should appear only on the palm of the hand that fired the weapon.
Answer: C
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