So when you ask "where is SAC Bloggs" and the chief replies "I sent him to get some milk" do you think:
a. The chief is lying and SAC Bloggs has slept in, I will sort him out.
b. The chief is lying, but he will sort SAC Bloggs out
or
C. The chief is telling the truth.
The chief may not be telling you the truth, but that is no reason not to trust him (or her).
But wait at least 15mins before going to get a coffee....