This clandestine pistol is modified to:
-be electrically fired
-be extremely quiet
-shoot a deadly poison that emulates a heart attack and doesn’t show up on autopsies
-be capable of shooting a target without them realizing they’ve been shot
-work at 100 yards
Video of the hearing: [3:57] https://youtu.be/4m6dldvNECI?si=
A small dart like bullet seems implausible, it might be too fragile. Here is an example of a more massive “bullet”. The results are a bit more than “undetectable” https://www.youtube.com/watch?v=o2lJRQCRfik