I have recently identified a plant growing near my home as Thevetia Peruviana. It belongs to the Apocinaceae family, well renowned for having plants which are among the most poisonous on Earth. However, I have found information about commercial growth of the plant for livestock feeding. Check these two:

https://tspace.library.utoronto.ca/ retrieve/4783/ja02030.pdf

http://www.ars-grin.gov/duke/dictionary/tico/t.html

The second website, mentions that the black pulp is said to be eaten in Ghana, while in another place I have read that a child has suffered from eating the fruit. Most toxicology reports I found so far refer to the plant parts, and to the seeds. I took into consideration that not all what is eaten by animals can be eaten by humans, and vice-versa. However, I did not encounter any article saying there are differences in toxic substances between the seed and the fruit pulp.