I would love proficiency in Medicine to interact with the illness that results from poison in some meaningful way.
I like [MENTION=6801299]Horwath[/MENTION]'s usage of a Medicine check in place of a Constitution check when fighting a disease.
Hmm... some possible uses of Medicine vs. poison might be...
Delaying ongoing damage from poison, so instead of happening every round it happens every minute or every hour. Buys time. Would need to clarify that a given poison can only be delayed once.
Rendering a poison (in non-living tissue) inert.
Might fall within the wheelhouse of Medicine and a poisoner's kit, both. Just wait for the look on a villain's face when your PC drinks that poison goblet of wine and toasts the villain with a knowing smile (having sprinkled some powder in the goblet first to render the poison inert).
mrpopstar said:
When your character looks over a body for clues and makes deductions based on those clues, I would ask for an Intelligence (Investigation) check.
If your character deduced that the body belongs to the victim of some sort of animal attack, I would ask for an Intelligence (Nature) check to recall lore that might help him determine what type of animal it was.
If your character deduced that the body belongs to the victim of some sort of illness, I might ask for a Wisdom (Medicine) check to diagnose what the illness was.
I think there's nothing wrong with those broad assertions, but the devil is in the details.
For example, the party finds a body and needs to know how long it has been dead for. I would ask for a Wisdom (Medicine) check if there was a chance of failure, or just tell them outright if I felt it was obvious. While we may have aging a corpse down to a science in modern times, I imagine in the faux medieval era of D&D that a character would be triangulating the answer "how long has the body been dead" from multiple sources and using their intuition. Sure, they may have read some medical texts, but principally they're drawing on their experience with corpses and their intuition of multiple signs to make an inference.
Where I'd have Intelligence (Investigation) come into play is the next step. What does it
mean to the PCs that the corpse is 3 days old. What significant things may have happened three days ago that might correlate with this corpse and its manner of death? Totally an Intelligence (Investigation) check.
Just a different approach, I suppose.