Tracking the untraceable; a phenomenon law enforcement is dealing with nationwide. 

Firearms without any markings or serial numbers are called 'ghost guns.'

"When these guns are recovered from a crime scene, we have no way of being able to tell our law enforcement where these guns came from," said John Ham, the Public Information Officer with the ATF.

Ham said most of what they are seeing right now are guns made from kits.

"You can purchase a kit without a background check, there's no record of the kit," said Ham. "You get home and you can assemble that gun with very little firearms knowledge or expertise."

Ham said you can build a gun in 45-to-60 minutes in most cases, and that process is legal.

"A person can manufacture a firearm for themselves for personal use but that gun can never enter into commerce," said Ham.

Originally, kits were for shooting sports enthusiasts but are now being taken advantage of.

"We have a competing element of criminals that are always trying to get their hands on guns," said Ham.

Ham works at the Kansas City Division, which covers Nebraska, Kansas, Missouri, Iowa, and the southern part of Illinois. He says ghost guns in crimes are not trending as much here as in other parts of the nation.

"Particularly on either coast where the firearms laws are a little bit more restrictive than they are in the Midwest," Ham said.

The Biden administration is currently pushing for a new rule that would require the kit guns to have markings.