Haunting investigations are usually conducted under conditions that are far from optimal. There is too little time to fully study the site and the history, it is impossible to bring along equipment sufficient to monitor many physically interesting aspects of the site, and sometimes there is implied pressure from the local hosts to discover something anomalous or to confirm that reported apparitions are not hallucinations.
The present studies were no exception to the general rule in terms of the available time and equipment we could bring to the investigations, but fortunately the local hosts in both cases did not apply or imply any pressure for us to find something anomalous.
From one point of view, of the two traditionally haunted sites, Engsö Castle was the more interesting because of the subjective experiences of Radin and Moody. On the other hand, Dragsholm had more reports of apparitional sightings, acoustic phenomena and movements of objects. We recommend further investigation of these sites by multiple, independent sensitives to see if they agree on the presence and location of 'entities' in the castle. For physical measurements, it would be interesting to use low frequency vibration detectors and time-exposure photography to survey the site.
Ideally, temperature, humidity, barometric pressure, geomagnetic field, and background ionizing radiation readings should be recorded at this site over many months, along with repeated subjective readings of any 'felt presences'. This would allow a comprehensive analysis of apparitional experiences in comparison to physical measures possibly modulated by diurnal and seasonal fluctuations.