Coffee and Caffeine FAQ

Hi,

If one filters the coffee, through a paper filter or cloth for example -- like straining, in other words -- does the resultant brew contain less caffeine?
It *seems* to make it less-strong, seeing as the oils get filtered out (?? I assume) -- is this so?

Is filtered/strained coffee less caffeinated?

Also, no one seems to have answered the question of loss of POTENCY, answering the question of flavor loss in its stead: Does coffee, before brewing actually lose caffeine over time? I've never heard that before.
And does it lose caffeine any other way? By "evaporation," as someone mentioned...sounds odd.

Anyone know?