The tanks used to store propane are sometimes used to store anhydrous ammonia, a dangerous compound that is used to make meth. The tell-tale sign a propane tank has been used to manufacture methamphetamine is the greenish blue color of the service valve on the tank. Once a tank has in fact come in contact with these meth compounds, the safety of the tank becomes compromised, and could turn deadly for an unsuspecting person gearing up for some grilling.
According to Police Lieutenant Ty Lewis with the Paso Robles Police Department, when a propane tank come into contact with meth manufacturing chemicals, “It'll break down the valve, obviously weaken it, and then poses a potential for the valve to break off. Since the contents are under pressure, it could potentially create a missile of sorts"
Law enforcement agents say it is especially important to check the valve on your tank if you are exchanging an empty one or a full one. In any case, if you pick up one of the tanks and the valve is bluish green, do not try to remove the valve yourself. Instead, contact your local police or fire department - it could save a life.
