Published: May 28, 2014 10:51 PM EDT
Updated: May 28, 2014 11:43 PM EDT

LEE COUNTY, Fla. - Shaky steps, confusion and even laughter. For the first time, only WINK News seeing footage from a field sobriety test taken by a former State Attorney's Office investigator.

Troopers say Charles Lawson was drunk on Christmas Eve when he hit and killed 48-year-old Michael Sasen on McGregor Boulevard in Fort Myers then took off.

Just before midnight, Christmas Eve, the 911 calls started coming.

"I was just driving by and a guy walked into the street, another car hit him, and that car took off," a female caller told an operator.

Investigators say Lawson hit and killed Sasen but kept going. Minutes later, he returned to the scene. Brand new dash cam video shows what happened, minute-by-minute, during his field sobriety test.

"Is there any probable cause that I'm DUI?" Lawson asked the Trooper.

"I can smell the odor of alcohol coming from you," the Trooper said. "I can. It's pretty strong and your eyes are bloodshot."
    
Before it starts, Lawson asks to go to the bathroom, even cracking a joke and laughing. According to an arrest report, Lawson couldn't mmoothly follow the light with his eyes and had trouble walking heel-to-toe and he even lost his balance.

The video shows the Trooper handcuffing Lawson, placing him under arrest. On the ride to jail, Lawson offers directions. "You don't go all the way down McGregor? Thats the quickest way," Lawson laughed. "That's the way I always go."
    
When asked to take a breathalyzer test, Lawson refused.

Earlier at the scene, documents reveal that Lawson said  he "was the one involved in the accident" but when questioned further, said, "I don't want to jam myself up. I'd be more than happy to cooperate with your investigation because, as far as I'm concerned, as long as... is this off the record?"

"No, this is still on the record," the Trooper answered. 

"Okay, then I probably need to speak with my boss first," Lawson said.

Cell phone records show that less than 5 minutes after the crash happened, Lawson was texting, making plans for later in the week. The new documents reveal that both Lawson and Sasen had been drinking at separate parties that night.
    
Lawson is currently out on bond awaiting trial. He resigned from his job with the State Attorney's Office in January. We contacted his lawyer and even stopped by Lawson's home but got no responses.