It's terribly disappointing that we are still at this stage. Most other states have gone ahead and done these studies. And there is significant anecdotal information that racial profiling does exist - and we still have not gotten a bill out of committee in Virginia.
The only way to do this properly is to have the state pass a law, and then have an independent agency or organization of some kind take the data collected by police at traffic stops and analyze it.
If this bill banned gay-straight alliances outright, it would be unconstitutional. But because it doesn't explicitly state that, it would be harder to make a constitutional case against.