We Tend To Watch A Lot Of Detective Dramas,

Sherlock Holmes, Poirot and many more, 

 so it was with some interest I may have found the plot for what Yvan Gaillard of the Laboratory of Analytical Toxicology in La Voulte-sur-Rhône, France said could be the perfect murder, so this could be the plot for the episode, Gaillard, who described the plant and it’s side effects stated “It is the perfect murder,” if you used the kernels of this tree and gave them to some one in their food, they do have a bitter taste, but this can be disguised if they are crushed and mixed with spicy food, 

they contain a potent heart toxin called cerberin, similar in structure to digoxin, found in the foxglove, so if you sweetheart says he or she wants to grow a Pong-pong tree (Cerbera odollam), it might be a wise investment as in times gone by to hire a food taster!