we'd have to be doing the studies, first. second, we'd have to know what we're looking for. if the effects were subtle, generational, or multiple and confounding, it would be hard to see even if we were looking. also, im sure the sample size is small. not a lot of people/animals spend years 10 feet from high-volts lines.
also, people are generally pretty change-averse. if there were proof that our current way of life was harmful, not a lot of people would be interested in discovering, spreading, or changing due to this news, least of all the companies with a profit motive. saving the turtles is fine if all you have to do is use a metal straw instead of plastic, but ask people to inconvenience themselves (less TV, less air-conditioning, less hot water, etc) and you've got a different response.