private static Hashtable<String, String> storePolice(String pdFile)
			throws IOException 
	{
		Hashtable<String, String> pdsites = new Hashtable<String, String>();
		BufferedReader pd = new BufferedReader(new FileReader(pdFile));
		String polInfo;
		while ((polInfo = pd.readLine()) != null) {
			String[] info = polInfo.split("\t");
			pdsites.put(info[1].trim(), info[0]);
		}
		return pdsites;
	}