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Elusive killer dubbed the grim sleeper. it was the 1980s, a serial killer was terrorizing south los angeles. most of his victims were young african-american women, some had been shot with the same .25 caliber firearm. some had been strangled. some sexually assaulted. their bodies dumped in alleys. over the years los angeles police would follow numerous leads that went nowhere. in 1988, after eight murders and an attack on a potential ninth victim who got away, the killing stopped. then nearly 15...

We went inside for a look at the technology that led detectives to technology that led investigators to the grim sleeper. it was the 1980s, a serial killer was terrorizing south los angeles. most of his victims were young african-american women. some had been shot with the same 25 caliber firearm. some had been strangled. some sexually assaulted. their bodies dumped in alleys. over the years, the los angeles police would follow numerous leads that went nowhere. in 1988, after eight murders, and ...

Police would have to wait another two decades to find the answers. >> we have 1.5 million samples stored in the laboratory. >> reporter: a critical piece of the puzzle would be found here in the third largest depository in the world. >> we are on the cutting edge of this technology. >> reporter: jill sprigz who heads the lap said scientists recently developed a new technology. if a killers dn is not in the database, maybe a relatives is. a major break, last year

To spot distressed wildlife, detect oil and send clean-up crew and vessels to the hot spots. the federal government claims the shrimp, rupert, tuna and other commonly seafood from the gulf of mexico is safe to eat. 400m samples have been chemically tested and so far none show level of contaminants. the seafood inspectors are trained to smell seafood for oil. only one sample failed the test and still did not show concerns level of contamination. b.p. examining legal options after the partner an...

Back on for me back when you were on the beat. what is it they are looking for? what are they going through? what are they hoping to find? >> i think their number one mission there is to find evidence that would link him closer to those cases in addition to what they currently have. and we know from some suspects, they like to recover trinkets from their crime. they may be evidence of the victims that are there, either samples or clothing or articles. im sure theyre looking for anything that can...

From area beaches. signs of disaster can still be found in the delicate marshes. >> its there. it hasnt gone away. the bacteria havent consumed the oil. >> reporter: after taking several core sediment samples, the unmistakable scent of oil remains. that is distinctive. you can really smell it there. >> now you see science, sometimes we have to search. but this is definitely tainted with oil. >> some areas remain close to shell fishing and those who oyster for a living say they feel for the count...

Statistics are everything, samples are everything in her world. >> reporter: im going to talk to her and get her to explain it to me. >> im not so sure about the scientific validity of this whole thing. but thank you for explaining that whole thing. talk about another wow. theres a nation in shock. it is japan. the national sport of sumo alleged links to gangsters? globe trekking is next.

Days. >> reporter: george hansen remembers the disaster clearly and has studied its impact for decades. what was it like in those weeks following the spill? >> well, after, and i say most everything in this area was killed, we say 90% mortality, it wasnt a hundred% because some of the animals will survive. >> reporter: the spill in 1969 killed scores of fish and lobsters, damaging oyster and clam beds. the company northeast petroleum sent cleanup crews and spent weeks raking oil from area beache...

And spent weeks raking fuel from area beaches. signs of disaster can still be found in the delicate marshes. >> its there. it hasnt gone away. the bacteria havent consumed the oil. >> reporter: after taking several core sediment samples, the unmistakable scent of oil remains. that is distinctive. you can really smell it there. >> now you see science, sometimes we have to search. but this is definitely tainted with oil. >> some areas remain close to shell fishing and those who oyster for a living...

>> hey, there, tamron. well, what weve discovered here. were in gulf shores, alabama. we discovered that desperate times require desperate measures. here we are on a beautiful beach and the fresh layer of crude has lapped its way into the sands and tamron, not 20 feet away we have this, protective border of tape. inside, precious cargo. this is a sea turtle nest from the endangered loggerhead and this will be a part of a modern day noahs art as they try to relocate these eggs to safer grounds. w...