detection, divination
You detect whether a creature is venomous or poisonous, or an object is poison or has been poisoned. You do not ascertain whether the imbiber is poisonous in multiple ways, nor do you learn the type or types of poison. Certain substances like lead and alcohol are poisons and thus can mask other poisons.
Heighten (2, 3, etc): For each level, you gain more precise information; first number of poisons, then types of poison, etc.