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Lead exposure. >> everybody is concerned about this water they don't know if the kids are sick or not becaus they're not doctors. >> reporter: the state has known about the elevated lead levels and that residents had access to the information, but many say enough wasn't done to warn them of the danger. are you upset? >> yes i'm very upset. >> reporter: michigan's department of health and human services also stepping in, offering blood testing for every child to monitor lead levels and providing access to medical care. >> it's always concerning whenever we're talking about children being expose...

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What prosecutors describe is a massive fraud that cheated investors out of hundreds of millions of dollars. mattis was a one-time board member at the company which claimed it would revolutionize blood testing. scan katie scannell joins us now. >> he took the stand as an early witness in this trial which has captivated silicon valley. he said when he first met elizabeth he became so excited about this prospect. it was supposed to be cheaper, more accurate and something they could do quickly. he invested personal money, $85,000. after "the wall street journal," which had broken a number of the s...

Back in the mid'80s, that wasn't the help it would be today. >> back in 1984, that could do a type of blood testing to determine whether or not an individual is a secreter or non-secreter. >> roughly 80% of americans are secreter, meaning they have markers for their blood type. the killer was a non-secreter? >> that's correct. >> blood tests revealed dance was a secreter. in addition, lance had an alibi, putting him 370 mile ace way. >> he was staying with his parents in amarillo, working with at the gym there. >> so he was eliminated based

Inspirational and this is the result. you have a smile on your face as a result of what emma has done. thank you very much. the trial of a new blood test, designed to detect more than 50 types of cancer before symptoms appear, begins today. the trial of a new blood test, designed to detect more than 50 more than 1a0,000 volunteers aged between 50 and 77 will be offered the tests, which work by spotting chemical changes in genetic code. researchers say if the trial is a success, it could mark the beginning of a revolution in cancer treatment. the nhs chief executive says this is an exciting dev...