DAYTONA BEACH, Fla. -- Police officers in Daytona Beach are swabbing the mouths of persons of interests during traffic stops with special DNA kits in the hunt for an elusive serial killer, sources close to the investigation told Local 6.

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IMAGES: Photos From Prostitution Sting
IMAGES: New Victim Photos
IMAGES: Prostitutes Hunt Killer

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Investigators said they believe the same man has killed four women execution style in the Daytona Beach area.

A profiler said the serial killer is likely clean cut and probably has a wife or girlfriend.

And, the Daytona Beach police Chief, Mike Chitwood, said detectives have the killer's DNA.

"Genetically, we know who he is," Chitwood said. "We have DNA evidence from the murder scenes -- so, we got that. That is never going to go away. And, sooner or later, we will match the DNA to the physical person and bring closure to everything that is going on."

Agents are using the DNA kits to collect as much DNA as possible during traffic stops and special operations in hopes on making a match.

Local 6 showed agents stopping a person of interest from Canada, who gave his DNA to officers on the street using the DNA kit.

The DNA kits are also being used in prostitution stings in the area.

Chitwood said over time, modern technology will lead to the killer.

"I can tell you that we are working really, really hard," Chitwood said. "I can tell you that there are a lot of things going on behind the scenes."

Anyone with information concerning the deaths is urged to call a new serial killer hotline at 888-619-5734.

Watch Local 6 News for more on this story.