code: def _process_results(self, results):
          
          results = [r for r in results if r[0] is not None]
          results = _DeepStringCoder('utf-8').decode(results)
  
          # The normal form of a DN is lower case.
          results = [(r[0].lower(), r[1]) for r in results]
  
          result_dns = [result[0] for result in results]
          logger.debug(u"search_s('%s', %d, '%s') returned %d objects: %s" %
                       (self.base_dn, self.scope, self.filterstr, len(result_dns),
                        "; ".join(result_dns)))
  
          return results
docs: Returns a sanitized copy of raw LDAP results. This scrubs out
          references, decodes utf8, normalizes DNs, etc.