Full Idea
When different kinds of causes compose, we want to explain what happens in the intersection of different domains. But the laws we use are designed only to tell truly what happens in each domain separately.
Gist of Idea
Laws apply to separate domains, but real explanations apply to intersecting domains
Source
Nancy Cartwright (How the Laws of Physics Lie [1983], Intro)
Book Reference
Cartwright,Nancy: 'How the Laws of Physics Lie' [OUP 2002], p.12
A Reaction
Since presumably the laws are discovered through experiments which try to separate out a single domain, in those circumstances they actually are true, so they don't 'lie'.