High schoolers create filter to remove lead in water
These elemental toxicity problems should be a problem of the past.
We have the science and the devices to detect and track them easily.I'm speaking about XRF analyzer. Currently it's still expensive : a 30K$  portable device, but that's because it's a low volume production.These are gun-like devices that you point to a material, it shines x-ray on it and analyze the rays that comes back, which allows it to determine the elemental composition and percentages of the material for free in a few seconds. Like magic.Today they are used for checking the paints for lead. They are used by precious metal buyers and sellers to identify precisely the content.But I dream of the day where anybody can just check its steak or salmon with it for traces of anything toxic. It won't detect all food safety problems like bio contamination or organic pesticides, but it can definitely make heavy metal poisoning a thing of the past, by helping track the supply chain, the same way that having an air quality monitor can help improve your air quality.