When it comes to UFO events it is difficult to find trace evidence. Firstly, many of those that witness UFO landings are reluctant to discuss what they have seen, and those that are willing to speak don’t necessarily know who to speak with. So collection of trace evidence goes by the wayside and it is as if the event never occurred. In November 1971 the small community of Delphos, Kansas experienced a UFO event which left an unusual form of trace evidence. In this case the soil had become Hydrophobic, meaning that it would not accept any water whatsoever. Thankfully a team from the Scientific Coalition for UAP Studies took a deep dive into this event and you can learn more HERE.