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Baseball player to receive that diagnosis and possibly the years of depression and erratic behavior leading up to his death. >> important cases make a difference because it is showing us that you don't need to have the kind of hits that we see in football or in hockey or in other real decision sports? you just need a lot of brain drama, it seems. kansas city chiefs suicide. and another high profile. kansas city chiefs player da vonn belcher shot his girlfriend and turned the gun on himself. now the belcher family tells the kansas city "star," they too suspect cte. on friday, belcher's body w...

"kansas city star" they, too, suspect cte and on friday belcher's body was exhumed so his brain can be examined. cte can only be diagnosed after death analyzing brain tissue. experts say examining one year after internment may or may not work. >> our brains are really important to us and we can't keep hitting them the way that we have been, so that doesn't mean stop playing these great sports. it means trying to reduce the amount of head trauma from an early age all through every level of play. >> major league baseball did release a statement. they said they met personally with freel's family ...

The evidence is and where it came from. >> reporter: samples from the bodies of victims according to secretary of state john kerry gives u.s. officials the evidence they need. >> it has tested positive for signatures of sarin. >> reporter: what are those signatures? how can we be sure this is a repeat of the slam-dunk that wasn't, the claim iraq that wmd? former weapons inspector who previously looked for cases in iraq says a signature of sarin is not something you can see or smell. >> think how any other chemical you are familiar with around the house can break down into other things. you're ...

Inspectors who were there can take blood and hair samples, brain tissue samples from deceased victims and run them through a device called a gas chromatography machine. even if that area of damascus was decimated by syrian army shelling right after the chemical attack, experts say it's not degraded to the point where you can't get an accurate test. they can grab samples from walls. they may not be prevented from getting an accurate sample. >> appreciate your reporting. secretary of state john kerry making the case for action abroad. cnn's elyse labott traveling with him.

You've already lost 50% of your brain cells. it's very difficult for any treatment to be effective at that point. >> but what if you could spot the disease 5, 10, even 20 years before you became symptomatic? he says he may have found a way by looking at the eyes into the brain. >> normally we don't think of the eye as an extension of the brain, but during the embryonic development, the retina actually develops from the brain itself, so it's brain tissue. >> one telltale sign of alzheimer's is a build-up of sticky plaques called beta amyloids. they're inside the brain. they could start to devel...