You can have the best testing in the world and the test will still only detect substances that it was designed to detect. By definition, it can't detect anythin

You can have the best testing in the world and the test will still only detect substances that it was designed to detect. By definition, it can't detect anything we don't know about or are looking for. The natural filtration process has been around since forever and we know it works well. There is no reason not to use it.