I enjoyed reading this as it demonstrates again (and certainly not for the first time) that security is not treated seriously, unfortunately.
Some people working in such buildings, e.g. lawyers and justice, are often aware of the fact that their life could be in danger for whatever reasons. Considering that they are protected from some sort of guards or other security protections, they may feel more secure but it is quite bad when the people who should protect are sleeping (although this can't be applied for everyone; there are certainly people who take their job serious).
I think it is really important to do such tests, even if it results in rolling heads. Better bogus rolling heads than real ones.
i'm currently working contract security, and durring the orientation we were told flat out "since 9/11 the chances of an attack have risen alarmingly, only through vigilance can we possibly spot a potential threat" they also after that little speach told us "if your caught sleeping you will be terminated on the spot" they dont want the 'minimum wage security guard' sleeping at his post as most movies and some news articles portray, though i do agree that government security has gotten a little if you'll pardon the term "half-assed" everyone at the company that i work for takes their jobs seriously, and make a vigilant attempt to spot potential threats, we also got training on what to do shuld we come across an explosive device, back away, cordon off, and call the police emergancy number from a land line (DO NOT! use Cellular phones if you suspect a device), but i digress, it is an eye opener that they were able to smuggle Live explosives and material into the offices of several federal buildings, we do need to wake up to this very real threat, but thats just my .02
