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>> we take them from a police officer or firefighter with no background to a position where they can successfully navigate their way through a call. >> bomb techs embedded with s.w.a.t. teams after the brothers used pressure cooker bombs at the boston marathon and terrorist couple used bombs to kill in san bernardino california two years later. fox news went inside the training. >> you have a hostage and a live device and something called a dead man switch, if the hostage takes their thumb off the red button, it detonates. >> removing hostage devices is the riskiest procedures because all the ...

Boston marathon. fox news went inside the training. >> this is from a top-tier threat, you've got a hostage and a live device and something called a dead man switch. >> it's obviously the riskiest procedure because all the procedures we do our manual and hands-on. it seems to make sense. >> fox camera stopped rolling to protect methods. the training is driven by foreign and domestic intelligence. >> we look at that threat stream, what types of explosives are being used -- that all comes to us. then we try to assess whether our current procedures and technology can address that threat. >> the a...

Throttle by actually physically opening it through some motion you could speed up the train. it would take some type of probably conscious movement to do so. especially with this type of throttle. but in general, i'm not familiar with the type of throttle on that particular locomotive how easy it is to move. but in general, it would not be easy. >> there's also been talk of like a dead man switch. can you explain that to me? >> ma'am? hello? >> barrett, it's brooke. you're on tv. do you hear me? can you give me a thumbs up? okay. we lost him. we're going to work on that. technology happens on ...

Issues there. having said that, this switch thing that he has. >> dead man switch. that is a way of rigging a bomb or explosive device that if you let go of it, like a trigger. a pressure point. if you let go of it, if that really is an active device it has the capability of exploding. people do it in war situations. you constantly holding it. like pulling a pin of a hand grenade and holding the grenade together with a trigger on the hand grenade. if you let go it will explode. if it is active and if the bomb is a real bomb if the police should decide to take lethal action against him if he fe...

Conference he was wearing a type of vest and the eyewitness described to me what he believed two pipe bombs on the front of the vests and four cannisters. i didn't recognize the type of gas but he said it was a type of gas used for welding and he said this were cannisters on the back side of the vest and he said lee had a weapon, but not a handgun from what he could see. in addition, he said to me he was holding something that seemed very bizarre. that was on top. it did not make a lot of sense but i have been told by law enforcement source had could be a "dead man switch," when someone is hol...