Also in this playlist...
This transcript is automatically generated
-- bear much snow have you seen these men they could be anywhere not just in Boston because -- -- hit the road right after the two explosions.
The FBI desperately wants phone tips but there are other investigative leads the FBI's chasing down tonight.
The banks to -- Lauren well they could also lead to the bombers skipped town I found this president Michael's face scientists -- nice to see you and tell me out if you're investigating this case and you had the -- -- these bag parts have been blown apart.
What exactly would you be looking for what can you do with the.
Both investigative stage there's a lot.
In the history of forensic science.
There was the great last great train robbery in the 1920s.
From -- detonator and a bad a couple of things that were asked -- -- the wizard of Berkeley.
Determined that -- -- they were looking for was a left -- lumberjack with this.
-- his weight and everything they want to know including eventually his name.
I've worked on that case a number of cases actually one of which involved.
A Fannie -- was left to hide behind murder of a family of four in Tokyo for the Tokyo police about ten years ago.
And in that -- through extract particles of sand -- told there was United States -- connection to to the desert.
In a case like this.
If was brought in from somewhere else that had records -- history its microscopic particles.
-- where it's been about occupations even potentially.
-- Savoy or insulation from.
Making up of a bomb.
Components for timing devices and so forth even.
Residue in there so it's investigative stage the -- you never know what you'll find.
And that's what we base -- look at everything -- analyze you recover and analyze always microscopic traces.
With the idea that something would ring a bell because you literally at the beginning don't know what you're looking for that's what you need to find out what everything is -- there.
Then the unusual things might start to -- you -- clues.
Is out isn't backing down like a bill like that knapsack or something our gym bag kind of feel like it's like a mop -- and absorb -- DNA particles so that you could make impressive DNA could do extract DNA from it for future comparison is that possible.
Put Williams certainly extract DNA -- -- thing as long as people handle without gloves.
And it also picks up on record of where you've been though by the dust that it contains so the the analogy used at the outset here was a sponge.
Absolutely it's a sponge and that's why we examined -- cases to figure out.
Where somebody's been what they've done.
And no clue -- no particles too small we looked at today we can magnify and analyze particles.
That we have to go to a 100000 times a million times Maine vacation sometime and do a chemical analysis of these little -- Pop pop up fiber transfer let's -- that there's some virus in the bag and you and me and you pick up the person to person might have some close up and is a fiber transfer some women as it possibly can do that kind of comparison to link the person with the bag.
We certainly can sometimes not just that maybe even the environment.
But that's us that would be a second step after you have someone custody in in the focus of the investigation changes.
From trying to identify a suspect or a location to actually.
To see if there's material which connects -- particular item in this case the knapsack.
With a particular individual their clothing that individual through DNA.
Look the clothing through fibers or the environment through that the various dust particles that are there -- -- -- pollen -- to put -- a particular location.
Or the minerals that are present or even chemicals are set from bomb making -- little particles.
I'll stick around.
We -- what makes Trace evidence so valuable is affecting you you can't see it you're not aware of it and there's almost no way to protect against us.
Skip thank you.
By the pictures the banks of fibers and the times they are all giant potential clues and right now investigators are rebuilding the bombs from fragments of some of the -- are very small.
The circuit board could also provide key information former FBI bomb technician Kevin miles joins us.
-- why is -- circuit board any of value in the investigation.
Or circuit board if if in fact it's part of this -- IDs like this containing circuit boards of any kind are are relatively rare.
In this country other parts of the world have them routinely.
But and and in this country there are few and far between I -- a couple in my career including one in Orange County not long ago.
Where a bomber actually use one of these items and blew himself up before -- could place it.
What this tells me if this is the case is the person who built this -- Has demonstrated a knowledge of IUDs that we normally don't see in the US on a regular basis.
Is there any information there is this circuit board and this one you know Eminem.
And -- we hear some different things but have you heard -- indicate their -- I have not.
Other than what I've heard on the news.
I now I'm what what other parts of the -- if you're gonna make eight and an and do an investigation is.
What other part of the Bob would you really like to see that would help you.
Lead to the people that yes -- invest.
-- -- all parts of the IED.
Have high have an evidentiary value of the backpack with a backpack is in fairly decent shape it's identifiable as a backpack.
It'll be sent back to the lead the label might be still want to manufacture the maker of the -- still on -- -- can be very valuable.
Normally on on ITDs with -- a lot of explosives the parts -- very small sometimes -- recognizable.
These investigators may have.
Almost the entire device to work with the team if -- The evidence is saying that he's in the shape the rest of it may be out there.
-- do you know if you're not going to be equal experience we both went to Princeton since buyer magazine and look at the directions on how to create a -- we both soda -- -- -- To make -- Bob what our bonds looked a lot -- or would they be person as a personal signature.
Well everybody has a personal signature like I said earlier I used to have when I built IED's for the FBI the list -- -- three years.
These individuals may spliced wires a different way together use different tape.
Everybody's individual -- an individual even when it comes ability IUDs.
Since I'd see him so that that may be to -- -- helpful lead if if there's -- are designed matching this bombing with perhaps another bombing.
Absolutely what the F there's gonna do is a look at that evidence and they'll research will be.
The components and see -- -- -- using a device that -- going to be this is a big deal -- battery I've I've never seen a -- like that before.
In my years I've every heard of that before so that's going to be -- a great investigative lead.
I had an email from a -- during the break that said that you can by the -- eBay.
And that there -- Chinese clones and sort of gave me the impression that it wasn't just sect could go to a couple of hobby shops and solo.
And there's a narrow universe a place right get it that it seemed much more prevalent than I thought.
And the FBI knows that I'm sure that running with a right now.
I'm -- the FBI is real busy back she -- I would be surprised if already they have the name of these two are they know what they are because I think the American people.
Really hustle on this one and I think I guess has somebody is at a CC initiative.
But thank you for joining -- seven.
Filter by section