If one inspected an unretouched profile photo of Lincoln, pre-beard, in 1860, one can discern the changes made.
Fox News has a security guard stationed in front of its TV booth, and as best I can discern, no other network has any.
Lately though it seems the line between spin and reality is harder to discern.
late 14c., from Old French discerner (13c.) "distinguish (between), separate" (by sifting), and directly from Latin discernere "to separate, set apart, divide, distribute; distinguish, perceive," from dis- "off, away" (see dis-) + cernere "distinguish, separate, sift" (see crisis). Related: Discerned; discerning.