code: def check_validation(self, cert):
          
  
          # CA certs are automatically trusted since they are from the trust list
          if self.certificate_registry.is_ca(cert) and cert.signature not in self._validate_map:
              self._validate_map[cert.signature] = ValidationPath(cert)
  
          return self._validate_map.get(cert.signature)
docs: Checks to see if a certificate has been validated, and if so, returns
          the ValidationPath used to validate it.
  
          :param cert:
              An asn1crypto.x509.Certificate object
  
          :return:
              None if not validated, or a certvalidator.path.ValidationPath
              object of the validation path