code: func (a *API) FetchCheck(cid CIDType) (*Check, error) {
  	if cid == nil || *cid == "" {
  		return nil, fmt.Errorf("Invalid check CID [none]")
  	}
  
  	checkCID := string(*cid)
  
  	matched, err := regexp.MatchString(config.CheckCIDRegex, checkCID)
  	if err != nil {
  		return nil, err
  	}
  	if !matched {
  		return nil, fmt.Errorf("Invalid check CID [%s]", checkCID)
  	}
  
  	result, err := a.Get(checkCID)
  	if err != nil {
  		return nil, err
  	}
  
  	if a.Debug {
  		a.Log.Printf("[DEBUG] fetch check, received JSON: %s", string(result))
  	}
  
  	check := new(Check)
  	if err := json.Unmarshal(result, check); err != nil {
  		return nil, err
  	}
  
  	return check, nil
  }
docs: // FetchCheck retrieves check with passed cid.