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Connected to karyns murder? to find out, investigators contacted richard monroe, a well-known forensic geologist. concrete and cinders were found with karyns body. could he tell if they came from the slovers car lot? both samples were placed in a scanning electron microscope and hit with high-energy radiation. >> in a vacuum in the s.e.m., the darkness in the chamber, theres no light source. the only light it puts in is the x-rays. >> this enables the images of the samples to be magnified up to ...

Suddenly, investigators thought theyd solved the mystery. it looked to be a phenomenon called pica. the word comes from the latin name for magpie, a bird that eats almost anything. >> pica is a condition particularly of children but not always of children. its sort of a craving for food items to eat. lead paint often tastes sweet. so heres a little malnourished girl whos never had enough food. and it became pretty clear she was probably picking up chips of paint and then sucking on them or chewi...

In, accusing him of murder and rape, among lesser charges. greenwood police went looking for elmore 36 hours after dorothys body was found. >> i was working second shift with the detective division and the call came in saying the suspect was at his girlfriend marys apartment. i went up and knocked on the door. >> the encounter was not what detective vanleberghe expected. >> i told them that we had a warrant for his arrest. and i told him it was for murder. his demeanor at that time was so noncha...

What it means is the introduction of chemical weapons. when you do that, you have a real issue with protecting troops. you have a real issue with insure ensuring the safety of civilians that might be in the battle zone. >> reporter: samples of an attack a few weeks ago confirmed mustard agent was use by terror group there. now two others are being closely looked at. officials hope more testing will tell them if mustard or possibly chlori chlorine, an agent the kurds say isis has used against the...

Days. your state is just one of four to require proof of citizenship at all and, surprise, the people most affected are low income kansans and, wait for it, african-americans. secretary kobach, enacting birter-inspired legislation to cancel 30,000 kansans right to vote will not help your party do better with minority voters. based on your actions maybe that isnt what your actual goal is anyway. sincerely, joy. and coming up, a volatile week in ferguson and why police took dna samples from some o...

Rounds in 40 minutes. >> reporter: the u.s. minutes will test samples from the patients and weapons to determine if they included mustard gas, a horribly powerful chemical agent that the u.s. now believes isis has obtained. multiple u.s. officials telling cnn the u.s. has already determined that isis fighters used a mustard agent during a separate attack weeks ago inside syria. >> this would be a new and worrying report, if its accurate. i have no doubt that if isis could get their hands on this...

43 minutes past the hour. the u.s. confirming this morning that the terror group isis recently used a chemical agent against kurdish forces in syria. another attack in northern iraq is being investigated as a possible chemical attack. cnn correspondent barbara starr says the evidence seems to support that conclusion. >> reporter: the patients came to this northern iraqi hospital with blistered skin and respiratory distress. the kurds say isis fired mortars at them containing a chemical agent. >>...

Isis could possess in small quantities. >> its a game-changer. the introduction of chemical weapons, when you do that, you have an issue with protecting troops and ensuring the safety of civilians in the battle zone. >> reporter: samples from an attack a few weeks ago near hasaka, syria, confirmed mustard agent was used. now two attacks this week in kurdish northern iraq are being lo closely looked at. officials hope to find out if chlorine was used again. kurdish fighters have proven capable ag...

Fingerprinting and photographing suspects. in his dissent, justice scalia joined by the courts three liberal women rained down hot fire claiming, quote, todays judgment will, to be sure, have the beneficial effect of solving more crimes. then again, so would the taking of dna samples from everyone who flies on an airplane, applies for a drivers license or attends a public school. perhaps the constitution of such a generic -- perhaps the construction of such a generic practice is wide, i doubt th...

Claims that isis used the same weaponized gas on kurdish troops in northern iraq, and both incidents raising serious concerns the terrorists group could use those weapons in a mass casualty attack. barbara, if confirmed do u.s. officials have any sense of where they may have obtained these weapons? >> this is one of the many questions that the u.s. right now is scrambling to answer. the patients came to the northern iraqi hospital with blistered skin and respiratory distress, and the kurds say i...