Google as Evidence?

I was watching a story on the Casey Anthony case. If you need a brief recap, she's on trial for killing her young daughter, a case featured by Nancy Grace.

But some new evidence introduced at trial was her Google records, where she searched for neck breaking, internal injuries, how to make chloroform, and a few other heinous topics--several months before the child went missing.

Which makes me think, as a mystery writer, I'd be in serious trouble should anyone I know be murdered. Poisoned? I have a least one book on the subject. Shot? I have bookmarked a few sites on weapons. Bomb? Yep, Googled explosives. And I've read more than my share of online autopsy reports.

What could police learn from your Google records?

Stay safe, everybody!