robklurfield
eclipse
It's a convention. Something easy to fall back on rather than taking a creative risk and assuming that your audience will get. A hack TV director knows that the audience will understand. I wouldn't impute much more meaning to it than this. The directors of these TV cop procedurals are probably worried that a color image spied thru the viewfinder would confuse the audience into convulsions as they try to figure whose point of view the shot represents ("gosh, is that what the cop is seeing or what the killer is seeing?"). Most of what's on TV dramas relies on habit, convention and formula.
Which is my exact point ... the photograph and black & white are like 'peaches and cream' ... 'hot dogs with mustard' etc etc!
There's a connection there that makes it obvious to joe viewer in case he hasn't realised ... 'This is a photograph!'
It's deeply ingrained in our psyche obviously.