Which area are you referring to, and where is it saying there is no crime? Without a link back to the page you were looking at, it's difficult for me to help you further with this.
I'd love the opportunity to work with you to find the answers regarding the crime rate in the area you're looking at. Email me directly with a link the the home you're looking at, and I will look into it for you.
You can reach me at email@example.com
Talk to you soon,
Community Manager, Trulia Voices