I read an interesting news release put out by Simon Fraser University recently. The study describes how current methods for determining toxicity are based on “water-breathing animals such as fish rather than mammals, birds or humans.”
What does this mean? The study report explains that this may cause the degree of exposure to be “greatly underestimated in some classes of chemicals.” 
The implications of this study are huge. It means that there are possibly thousands of chemicals, insecticides to perfumes, which could have an unknown potential to accumulate to high levels in humans.
Let’s hope that this study encourages changes to existing study methods. 
Toxic Nation Campaigner