Having worked as a cop, I've a view of truth/lying that might be different. For me, it's all a matter of degree. Going to court week after week, year after year, I'm convinced that EVERYONE lies. What you choose to lie about, though, is most significant.
Lying about what you saw to an officer of the court, is much different than telling your wife she doesn't look 'fat' in those jeans.
I work hard to tell the truth about significant things, but don't 'sweat the small stuff.'