Other researchers have zeroed in on other culprits, whether inferior schools, lower teacher expectations, impoverished family backgrounds or some combination.
As a result, the Iowa division of criminal investigation could not comment on whether updated technology and DNA evidence could lead to a culprit, and whether there are alternative suspects under consideration.
Lord Cullen could not suggest what should happen to the potential culprits or whether criminal action or damages should be sought against Railtrack.
At some point, those words have to mean something, whether the culprit is the Syrian government or the rebels.
But the F.B.I. has also begun investigating whether the culprit might be a government insider, and is questioning its lab workers.
Whether the culprit is Paul Sorvino's sausage-and-pepper patriarch in "That's Life," Jerry Vale and his "Mob Hits" CD or James Gandolfini's savage Tony Soprano, far too many Italian-Americans are quick to betray their heritage for 15 minutes of shame.
The "Real Story" episode, first broadcast in May, revisits the terror, discusses whether the culprit was really a great white shark or another species, and then tries to ease your fears by telling you that more people die from bee stings than shark attacks.
No one seems to be sure whether the culprit was the tracheostomy, now just a silver line at the case of his throat, around which his chest hair has grown back and where toast crumbs gather, or the five months of disordered consciousness (for those not in the trade, think coma-with-eyes-open) in which his throat muscles were dormant and subsequently atrophied.
It's not always easy to determine whether the culprit in such cases is the EU, or member countries following its directives haphazardly.
"It is still being investigated whether the culprit is a repeat offender," a Delhi police spokesman, Rajan Bhagat, said in an interview.
