Recent reports from overseas have revealed that rogue refrigerants were used in hundreds of transport HFC-134a refrigeration systems, which resulted in a number of explosions and at least three deaths. World trade press, industry manufacturers, and watchdog websites have been issuing statements in recent weeks as part of this ongoing story. While details are still sketchy, the dramatic events have demonstrated the importance of knowing that the refrigerant a contractor works with is what it says it is on the label and the dangers of “topping off” with anything other than that refrigerant.