Federal law that prohibits Realtors from "steering" consumers away from an area. Steering can occur when Realtors call an area safe or unsafe. For this reason you probably won't get a straight answer to your question on Trulia.
The law seeks to prevent neighborhoods from being damaged by a Realtor's idea of what is safe. The idea is to let consumers decide for themselves rather than let the realtors dictate the market.
Now you know why your question is being answered with references to other websites.... more