Centre County District Attorney Michael Madeira said evidence still being analyzed could lead to an arrest in the mystery murder case of Penn State student Langston Carraway.

Although some evidence has been returned to the county, Madeira said many different laboratories are processing evidence.

"All of the labs are busy," Madeira said. "It is not like television where you give it to them and an hour later they have results for you."

Carraway, of 110 Northbrook Lane, was found June 5 in his apartment by a family member who reported to police that he did not have a pulse. His death was ruled a homicide June 6 by Centre County Coroner Scott Sayers, who said Carraway, 26, died of "massive blood loss as a result of a stabbing."

There are still no suspects in the case.

Robert Shaler, director of forensic science at Penn State, said the process of analyzing DNA takes only a few days, but realistically, it is normal for DNA results to take months -- as is the case in the Carraway murder.

Shaler, who was the director of the DNA laboratory in the New York City medical examiners office during the Sept. 11 attacks, said if there is no back-up of cases it typically takes three days to process blood, if everything goes as planned.

Realistically, Shaler said any DNA evidence sent in for processing takes more than three days because there is more than one case being processed.

When Shaler was the director of a DNA lab in New York City medical examiners office, he said the turnaround time for his lab was 39 days

-- the fastest in the nation. Shaler said in most cases, the turnaround time is up to six months.

"It has to do with budget, facilities and case load," he said. "The most important thing is not necessarily getting it done fast but making sure it's done correctly."

He said the DNA first has to be removed from the blood, then analyzed, then interpreted, and a report has to be written.

The turnaround time for DNA in hair can take up to three weeks, Shaler said, depending on the method used. He said to extract DNA from hair, it must first be dissolved, which takes 24 hours and lengthens the process.

Madeira would not comment on the specific kind of evidence sent in for processing, but he did say multiple knives were found at the home of Carraway.

He would not confirm or deny if a murder weapon was found or if he thought the weapon was brought into Carraway's home.

Patton Township Police Chief John Petrick would not comment on any DNA evidence found at the scene or results that may be still pending.

The Harrisburg lab that processes DNA for Centre County did not return multiple calls for comment.