Just because we can't measure an effect, it doesn't mean that one doesn't exist. This seems like a really unscientific thing to say. But remember that the wor

Just because we can't measure an effect, it doesn't mean that one doesn't exist. This seems like a really unscientific thing to say. But remember that the world is not a lab where you can exactly control conditions. There is no control group, and the null hypothesis cannot be proven. But we still have to deal with that complex world and make choices. To believe that a novel substance is benign until proven otherwise is just a form of bias. There is no objective reason why a substance should be innocent until proven guilty. We just have to adopt that policy out of practicality!