Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

[EX Q]: So, this question is not really about the series the Mentalist, but I think it fits here anyway.  First, I am not from US, so I dont know if CBI really exists or was made up only for the series.  In the series Wayne Rigsby and Grace van Pelt have an hidden relationship because it is not allowed at CBI. Everybody warns them to keep it a secret, because otherwise that would have consequences and one of them would have to leave the CBI.   Is this really a rule at CBI or similar American criminal bureaus? What is the reason for this rule? In Europe I have never heard of such a rule, as far as I know relationships are not forbidden here when working together in a police-like environment.
[EX A]: Is it forbidden to have a relationship in CBI in reality?

[EX Q]: After seeing Men in Black III, I still don't understand why K became such a cranky, stoical figure. It is a question even Agent J was puzzled about!
[EX A]: What happened to Agent K to make him so grumpy and emotionless?

[EX Q]: In Patriots Day, Dun Meng is video calling to his parents about his new vehicle. (This happens at the beginning of the movie).      The terrorist hijack his vehicle later.  The next victim, this cute couple appeared on screen even before the attacks.    After the attacks, this couples lost their legs in the terrorist attacks.  What is the significance of showing the victims even before the attacks?
[EX A]:
What is the significance of showing victims even before the attacks?