Undetacted poison

It seems like you might be looking for information on undetectable poisons or means of poisoning that evade detection. Many traditional poisons have specific tests available to identify them, but some substances can be more challenging to detect due to their chemical properties or the timing of their administration. Here are a few examples that have been historically noted: 1. **Ricin**: A highly toxic substance derived from castor beans that can be lethal in small doses. While it can be tested for, it may not always be detected quickly after exposure. 2. **Polonium-210**: A radioactive element that has been used in high-profile poisoning cases. Its effects can take time to manifest, and detecting it typically requires specialized equipment. 3. **Digitalis**: Found in foxglove plants, this substance can cause heart problems but may not be detected in routine toxicology screenings. 4. **Chronic poisoning with heavy metals**: Metals like lead or mercury can accumulate in the body over time, making detection difficult unless specific tests for these metals are conducted. 5. **Some synthetic drugs and substances**: New psychoactive substances (NPS) and certain designer drugs may not be detected on standard drug tests. Detection depends on various factors, including the timing of the sample collection, the type of poison, and the availability of specific screening tests. If you have a specific context in mind (e.g., a fictional story, a historical case, or something else), please provide more details, and I can assist you further!