Hell, I actually arrest people for lying... and nothing else. False statements to a federal officer is a felony. 
I have arrested several people protecting others, to include a few mothers. I use it more as a tool to get the person I am after. For others (contacted as part of our investigation but not the target) them telling the truth could be the difference in just seizing contraband or charging them locally.
We bring evil things to evil people, kicking in a door near you!
."In theory, there is no difference between theory and practice. But,
in practice, there is."
- Jan L.A. van de Snepscheut
"The difference between 'involvement' and 'commitment' is like
an eggs-and-ham breakfast: the chicken was 'involved' - the pig
was'committed'."
-unknown
Working on a PhD in CQB one doorway at a time.
When the wolf attacks, he will find not all who run with the flock are sheep!