Well, any computer connected to the Internet can be hacked into...theoretically. But one can make it very, very, very hard.
A big thing, of course, is simply to take common sense precautions. I remember seeing something on a web page recently. Somebody who, graciously, was performing a virus check on my system. And, oh, dear, they turned up several viruses on my "C:" drive. Amazing trick, since I don't have a "C:" drive.
But I can imagine many users clicking on the "click here" spot on that "virus checker" And then going on to do whatever it wants. Which could, ultimately, be evil. For all I know, it might actually install a few viruses while cleaning up supposed infections.
Back to the original topic, the thing with laptop checks is that no hacking is required. They take the computer, and study it. And that applies to a laptop used just for Internet surfing. Or a laptop that has never been connected to the Internet, used as some sort of production machine.