Yes, there is a common misconception that the body armor used by law enforcement is indeed bulletproofed. The correct term is "Bullet Resistant". A high-velocity projectile such as a bullet or a shrapnel will make some form of deformation upon impact, it is Physics. Bullet resistant materials such as steel and Titanium are used by the military in armored vehicles to protect the lives of soldiers. Kevlar and Lexan are cloth fibers manufactured by chemical companies and are used in armored vests to protect the chest cavity of a person. Survivors of direct shots experience hematoma or bruising on the skin where the bullet hit on impact. What the kevlar fibers do is spread out the force of the projectile thus preventing penetration, but the force is still similar to power punch enough to leave a bruise. There is a continued research in using carbon fiber materials in order to make a perfect anti-ballistic vest where the user will not be bruised. You may not be the Man of steel but wearing Kevlar vest in a firefight might help you survive to tell the tale.