Once ingested, water dissolves a disk of sugar, using a spring to release a tiny needle made up almost entirely of freeze-dried insulin. The needle is injected into the stomach — which the patient can’t feel, owing to a lack of pain receptors in the stomach. Once the injection has occurred, the needle can break down in the digestive tract.
With the right compound in the needle, thst sounds like an incredible way to assassinate someone without leaving any traces which are unlikely to be found. The combination of a tiny needle mark on the inside of the stomach, a lack of dissolved pills in the gut, and a likely delay between administration and onset of effects, it’s sort of perfect.