The education of the suspect is also extremely important -- and family dynamics play a role in determining the mental stability of a suspect as well as possible motives.
For now, the warring sides of the Khan family will wait to see if the latest round of testing helps the police name a suspect.
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Meanwhile, a friend of the surviving suspect in the bombings was released from federal custody Monday amid a swell of support from family and friends, but was under strict house arrest and only allowed to leave his home to meet with lawyers and for true emergencies.
One of the senior Obama officials, who bluntly said the Republican attacks have "frustrated the hell out of me, " asserted that gaining the trust of the family was the best way to handle the case and helped the administration gain valuable intelligence from the suspect, who is believed to have ties to an al Qaeda affiliate in Yemen.
Despite his views and experiences, Ruiz said he was shocked to hear what Castro was accused of, saying the suspect comes from a family admired in the community.
He also said police don't know of any relationship between the suspect and the Ripken family.
This involves searching for close, though not exact, matches in the DNA database, in the knowledge that such hits could represent family members of a suspect.
"As you can imagine our entire family is devastated, we are in a state of total shock, " the suspect's uncle, Arnold Pistorius, said in a statement.
Federal prosecutors told the court that when they went to the home of the suspect to arrest him in an early morning raid, his family was already dressed and destroying evidence, leading the investigators to believe that he had been tipped off.
There is a hint of danger in the air when police eject an entire family from their home after they think they spot the suspect hiding inside.
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The defense also called former prosecution investigator Jack Solomon to testify about his pursuit of Skakel family tutor as a suspect in 1991 and 1992.
Figuring out how to balance a demanding career and a commitment to family represents a difficult if not impossible balancing act for almost everybody, and I suspect that in many intense workplace environments, efforts to prioritize family time often elicit just the sort of suspicious critique you see in the Politico piece.
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