Discussion
In test firing, the test pallets are obtained in :
Answer: D
Test bullets are obtained by firing into water.
To compare a crime bullet with a suspected firearm, the examiner fires test shots from that weapon and recovers the bullets undamaged. A long water tank slows the bullet gradually without scratching it, so the rifling marks (lands, grooves and fine striations) are preserved for comparison under a comparison microscope.
Cotton wool and rags were used in older bullet-recovery boxes but can leave abrasions and fibres on the bullet. Solid wax is not a standard recovery medium. The water tank is the method of choice in modern laboratories.
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