Originally Posted by sefrischling
Other than that, you can contact the US Dept of Justice in Washington DC. The USDOJ can run a "wants and warrants" check on you through NCIC.
You are aware that many warrants are not entered into NCIC, and are only retained in state systems? That is certainly the case in California. I'd be surprised if you can just make a phone call and have warrants checked. I know my agency won't do it.