I understand that police officers as first responders need to have some basic first aid knowledge but this doesn't even seem legal. Chest decompression is an ALS skill which even in EMS and performed by educated paramedics requires medical direction (usually by standing protocol). I don't see how an average police officer can legally perform the skill without a physician director to practice under. I would also be wary becuase although, the skill can most likely be taught in a very short amount of time, the reasoning behind it may be more complex. Sure a person could probably learn how to locate a landmark and poke a needle till they hear a pop, but without assessment equipment and experience in assessing patients, I would be concerned with the procedure being used when it is not indicated. I agree that this is a disturbing thought.
Afterthought: I do remember seeing at least one place where LEOs are paramedics as well. If he is talking about a case like this I could see it as reasonable.