Hydrogen cyanide and cyanogen chloride are widely available, colorless, and come in gas or liquid form with high volatility. Hydrogen cyanide has an odor of bitter almonds; however, many people are not able to detect this distinctive odor [119] . Cyanogen chloride has a pungent, biting odor. They are absorbed through skin and respiratory mucosa. Mechanism of action is by interruption of the citric acid cycle and halting oxidative phosphorylation, inhibiting aerobic energy production and leading to rapid cell death [1] .