How about the word technically? What does it mean?

I was just listening to public radio. They were discussing ethics, and I heard the panel members TWICE tell a caller, "Technically, you're breaking the law."

I don't see what's technical about it. She was knowingly employing an illegal alien. That's against the law. The law is perfectly plain. What she was doing was perfectly plain. It doesn't require a technical explanation. So in what sense was her breaking the law "technical"?