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Despite its design, the swing feature of the bridge was never used, and investigators discovered it wasnt connected properly. >> since they never did use it as a swing bridge, they never did put in the same amount of tie-downs at the ends of the bridge to hold it in place. >> divers also examined the wood pilings that supported the bridge. >> we wanted to determine if the piles had undergone any kind of deterioration such as damage from wood-destroying organisms like soft rot or brown rot decay....

Going on then, because i always felt i knew i didnt do it. so therefore its impossible for them to prove youve done something you havent done. with no evidence, nothing but a bunch of rumors, ghost stories and smoke screens, i didnt think there was any way in hell they were going to be able to get away with that. >> our investigators were obtaining dna samples in the form of hair, cigarette butt, oral swabs from people who had some connection to the events. these included samples from several pe...

Incoming asteroid, deflect its trajectory by using the gravity of the spacecraft and eventually land some astronauts on board that asteroid or meteor and take samples and bring it back to earth. big trick here is to spot and see these threats before the incoming threat sees us. jenna: we would like to be able to do that as well as we can. thank you. p jon: that one over russia was scary. there is growing evidence that doctors are on the move these days. weve told you before that many family doct...

Out of the sample and look for it in other samples. >> trace analyst, cassandra burk extracted these threads and viewed them at 40 times magnification. >> and as soon as i looked at them under the microscope, i could tell they were animal hairs. >> prior to the 1940s, animal hairs were commonly used as a binding and strengthening agent in plaster. this meant the murder site was probably in a house built before 1940. unfortunately, there were thousands of them. [ male announcer ] this is the cat ...

>> erics parents were very adamant that ann was not involved. they had accepted ann into their family. she was their daughter-in-law, and they had a good relationship with ann. >> but strangely against the wishes of erics family, ann insisted that erics body be cremated. >> everyone that follows any type of forensic investigation knows thes yes, sir way to get rid of evidence is by creating somebody. >> eventually ann miller quit her job, sold her home and moves three hours away to wilmington, n...

A refractive index. >> refractive index is a measure of the speed of light through a transparent object. >> the glass is placed in a silicon liquid, then heated. the point where the glass disappears is called its refractive index. >> the five fragments that have the same refractive index as the fragments that were recovered from the door are consistent with having originated from the door. >> they came back with not only the glass fragments that matched the windowpanes, but also paint and wood s...

The entire length of the jumper cables including the clamps on the end. >> dna tests identified where the blood came from. >> all genetic markers that we tested for the evidence samples, the blood samples from the car and from michelle johnson all matched. >> this left only one explanation. michelle was inside haslers truck and bleeding. >> it totally contradicted lukes story. she was inside the truck with luke and that it was her in lukes truck. and he said he only put her in the back of the tr...

Darrell norths murder was so violent that forensic tests were needed to make sense of what happened. >> we had numerous types of blood stains. they included passive blood drops. we had smears, transfers, and frankly there was so much blood that you would be hard pressed to try to classify some of it as to how it got there. >> we took many samples. we took 23 samples of blood from various different parts of that crime scene. >> they first had to determine if all the blood had come from darrell no...

Two days later, she was gone and pat was dead. >> she stripped sunday night, danced sunday night at the outer limits and then she and her boyfriend leave town. >> police issued an all points bulletin for laura england. in the meantime, at the crime scene, investigators made some important discoveries. first, there were bloody boot prints throughout the house and they had been made at two different times and several hours apart. >> you could see that someone had exited the house and then, apparen...

Death, police got a break. a nurse, who worked in the hospitals emergency room, called police with some important information. she said when kathy was first admitted to the hospital, she and a co-worker didnt believe kathy was having a heart attack. instead, they suspected she had been poisoned. so they immediately took samples of kathys blood and urine and had them frozen. if kathy had been poisoned, with succinylcholine, freezing these samples might give investigators the evidence they needed....