Video Shows Chattanooga Gunman's DUI Arrest

Family believes his DUI arrest may have led to his violent spree months later.

— -- Newly released video shows the Chattanooga gunman being arrested for driving under the influence earlier this year, an incident his family believes may have led to him opening fire at two military offices in Chattanooga, Tennessee, killing five service members.

The video also shows Abdulazeez taking a field sobriety test. After walking the line, an officer notes that Abdulazeez "is counting steps that aren't happening."

An officer said he also noticed irritated nostrils and a white powdery substance under his nose, but Abdulazeez responded that he had "crushed caffeine pills and snorted them" and that he was around friends who were drinking and smoking marijuana.

Abdulazeez, 24, was charged with driving under the influence. He refused to consent to the state blood test, police said.

Earlier this month, Abdulazeez opened fire at the Navy Operational Support Center and the Marine Reserve Center in Chattanooga before he was killed by a police officer.