Poison when swallowed or inhaled have serious signs and symptoms ( nausea, seizure, confusion, vomiting, difficulty in breathing), because it include highly chemicals not meant for human ingestion or contact, such as cyanide, paint thinners , some mushrooms etc, potassium and chloride which is common in the heart attack victims due to muscle damage is the least detectable because they do not meet the criteria of being ingested. read more