btw that should be cholinesterase inhibitor.  I remember the symptom mnemonic (SLUD) better than the toxic agent.  iirc it is in the notorious organophosphate family.  it is interesting that while CDC officially categorises these as "non-persistent," Cornell's taxonomy of industrial/ag toxins notes tersely that "Organophosphates tend to be persistent and to bioconcentrate in environmental systems."

Read-it-and-Weep-Department -- this gives some idea of what organophosphate exposure can do to a mammal.

The difference between theory and practise in practise ...