I dont know abot DHS, but as I mentioned here in NC at 25 yards an officer has 60 seconds to fire 12 rounds, 6 standing, 6 prone, with a mag change, and on top of that, the "average beat cop" doesnt have a competition to worry about, he has his pay check, career, retirement, and family riding on his qualification. I wish I would have 12 minutes to fire 12 shots qualifying without risking my job! Kinda hard to compare losing your job to losing a competition. It can be more pressure then some folks realize at times...
Also, I know nikn10 mentioned wanting to test hisself against a LEO qualification type shoot. Its kind of hard to test without having the pressure of losing your job if you fail. I do better shooting the same course with friends then I do putting my job on the line when I qualify.
If a person really wants to compare an "average police officer" to an "average non police officer" lets compare stats as to 2 shootings at the same distance with a very similar target (stationary or moving for both) and see how it goes...My bet it would be similar as to the results. Also I am comparing average against average. Im not trying to compare a regular top competition shooter to a LEO who shoots only at qualification. Id love to compare several different groups of shootings, that involve an average LEO defending his/herself at "X" distance vs an average non LEO defending his/herself at "X" distance, who both have similar skill level. Again, I will say if we are comparing 2 shootings that are very similar in regards to distance, target, cover, skill, etc, the results will more then likely be similar. There is nothing that makes a LEO better then a non-LEO, and there is nothing that makes a non-LEO better then a LEO if both are the "same average" and face the same type of threat/target.