Use "poisonous substance" in a sentence

1. poisonous substances, which could someday result in no need to have these collections, as we will have graduated to a cleaner, less toxic planet

2. sources, poisonous substances tend to accumulate in the body and the health

3. They said it would be necessary to regularly refresh poisonous substances to

4. Some fishes that are otherwise good to eat, such as the Barracuda and Snapper, are inedible when taken from reefs and lagoons, where they will have absorbed poisonous substances with their own food

5. Again, I do not think that it can be explained by supposing, that the salt is absorbed into the plant, and thus acts as a poisonous substance