back in 1979. a few years ago the producer of that 1979 report came to see me at knbc, and he said there's a lot more to the story that we broke back in '79. you have to continue our work. you have to dig deeper. >> you might be wondering why we should care about a nuclear accident that happened half a century ago. because as you're about to see thousands of people in the san fur nndo and seem ae valleys have been secretly exposed to dangerous radioactive fall out. >> it was pretty clear to me there were people inside certain government agencies like the dtsc who were very close with boeing. >> that was a very effective way for boeing to buy protection for themselves. i was looking into the department of toxic substances control, and i decided to look into how is it really regulating toxics. and we did get very revealing material that showed us that the dtsc is what i call a captured