ABC7 News takes a tour of one of the country’s three ATF labs to show how evidence is examined.

The lab in Walnut Creek, Calif. – the others are in Maryland and Atlanta – has state-of-the-art equipment used to help investigate fires, explosives and weapons.

At the heart of the lab is a forensics examination room where scientists examine the types of liquids or material used cause explosions and fires.

ABC7 News shows how investigations work and the equipment used to investigate.