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)

Another chemical substance, that kills by causing heart attacks, and is confused with caffeine consume...is oxalic acid! This chemical is very dangerous either on inhalation, either on liquid form, contacting the skin! Autopsies will reveal only, cardiac arrest of natural causes!

Good morning! welcome back to war! So, we've been in phenol, for use inside an umbrella...did we forgot succinylcholine ? (succinylcholine is a strong muscle relaxant that paralyzes the respiratory muscles) Autopsies don't determine the toxicology , and conclude the dead was from an heart attack! succinylcholine is confused by caffeine! its also knowed by being a potent inhalation anaesthetic!