Why must discharged evidence bullets be handled carefully?

Discharged evidence bullets must be handled carefully primarily to avoid damage to striation markings. Striations are microscopic, unique grooves and scratches that are imparted on a bullet as it travels through the barrel of a firearm. These markings are crucial for forensic analysis because they can provide significant information about the specific weapon used in a crime.

If the bullet is mishandled, these striation markings can be altered or destroyed, rendering the evidence less reliable or even unusable in court. Preservation of the integrity of the bullet's surface is essential for forensic experts to match the bullet back to the firearm, which can be a pivotal element in an investigation.

While retaining fingerprints, preventing corrosion, and preserving weight are also relevant to the handling of evidence, the striation markings are particularly vital for linking the bullet to a specific weapon, making this aspect the most critical in forensic investigations.