to tank) 4. Describe the type of evidence that could be recovered from firearms bullets, and cartridge casings that could help link evidence to a particular firearm.

## Step 1<br />The question is asking for the type of evidence that can be recovered from firearms, specifically bullets and cartridge casings. This evidence can help link evidence to a particular firearm.<br /><br />## Step 2<br />The evidence that can be recovered from firearms, specifically bullets and cartridge casings, is known as ballistic evidence. This evidence can be used to link evidence to a particular firearm.<br /><br />## Step 3<br />Ballistic evidence can be used to link evidence to a particular firearm through a process known as ballistic fingerprinting. This process involves examining the unique markings left on a bullet or cartridge casing by the firearm from which it was fired.<br /><br />## Step 4<br />The unique markings on a bullet or cartridge casing specific firearm from which it was fired. This is because each firearm has unique rifling characteristics that leave unique marks on the bullet or casing.<br /><br />## Step 5<br />The rifling characteristics of a firearm are the spiral grooves cut into the barrel of the firearm. These grooves leave unique marks on the bullet or casing as it passes through the barrel.<br /><br />## Step 6<br />By examining these unique marks, forensic scientists can often match a bullet or casing to a specific firearm. This can help link evidence to a particular firearm.