Again...welcome back to war! Another chemical compound , that in overdose (1gr) will provoke sudden dead from cardiac arrest, and is confused by common analgesic (with or without  coffee) consume in forensic detection, is acetaminophen and caffeine (see also, Fioricet medication) However it can not be used as murder weapon, trough skin contact...only ingestion (see also, codeine phosphate ) (medical dose use under 60 mg)