Abby's Lab.

"What you got for us Abs?" Gibbs asks handing her a Caf-Pow.
"No identification was found with John Doe's clothing. His blood showed no indication that he had been drugged or used drugs, he was not affected by alcohol or had any major illness that would show up in his blood."
"So we've got nothing." Abby glares at Tony.
"We got a partial print at the crime scene which I'm still running. I've also run the victim's prints through AFIS and all the usual places and there's no match anywhere."
"That's not possible Abby. Are you sure you checked everywhere?" Abby glares at McGee.
"Sorry."
"No prints anywhere" muses Gibbs.
"That would mean he is not in the military, never held a government job, has no criminal record or" Ziva's eyes light up. "that someone removed his prints from the records." Abby finishes the sentence.
"Is that possible McGee?"
"Well Boss the person would need to hack into a DOD designed server secured with level nine encryption, find the right file with a search algorithm, delete all trace of it and disguise their tracks whilst doing so. So in theory"
"McGee!"
"Yes, someone could Boss. Though it would be nearly impossible unless you already had access to the system."
"Probie only law enforcement agencies have access to all of those records. Are you saying that someone at one of them is somehow involved in a murder?" asks Tony looking highly doubtful.
"That is precisely what I'm saying Tony." McGee stands his ground.
"Just because you deduced it doesn't make it so McSherlock."
"But Tony it's the only thing"
"That makes sense." Gibbs finishes. The team stands for a moment in stunned silence.
Abby's vid-phone pings to life showing an image of Ducky.
"You there Jethro?"
"Yes Ducky."
"You better come down here and see what I've found."

Next Chapter - Ducky's discovery.