code: def check_statement(self, stmt, max_paths=1, max_path_length=5):
          self.get_im()
          if not isinstance(stmt, (Modification, RegulateAmount,
                                   RegulateActivity, Influence)):
              return PathResult(False, 'STATEMENT_TYPE_NOT_HANDLED',
                                max_paths, max_path_length)
          if isinstance(stmt, Modification):
              target_polarity = -1 if isinstance(stmt, RemoveModification) else 1
          elif isinstance(stmt, RegulateActivity):
              target_polarity = 1 if stmt.is_activation else -1
          elif isinstance(stmt, RegulateAmount):
              target_polarity = -1 if isinstance(stmt, DecreaseAmount) else 1
          elif isinstance(stmt, Influence):
              target_polarity = -1 if stmt.overall_polarity() == -1 else 1
          subj, obj = stmt.agent_list()
          if subj is not None:
              subj_mps = list(pa.grounded_monomer_patterns(self.model, subj,
                                                      ignore_activities=True))
              if not subj_mps:
                  logger.debug('No monomers found corresponding to agent %s' %
                               subj)
                  return PathResult(False, 'SUBJECT_MONOMERS_NOT_FOUND',
                                    max_paths, max_path_length)
          else:
              subj_mps = [None]
          obs_names = self.stmt_to_obs[stmt]
          if not obs_names:
              logger.debug("No observables for stmt %s, returning False" % stmt)
              return PathResult(False, 'OBSERVABLES_NOT_FOUND',
                                max_paths, max_path_length)
          for subj_mp, obs_name in itertools.product(subj_mps, obs_names):
              result = self._find_im_paths(subj_mp, obs_name, target_polarity,
                                           max_paths, max_path_length)
              if result.path_found:
                  return result
          return PathResult(False, 'NO_PATHS_FOUND',
                            max_paths, max_path_length)