Don't you think that any biological investigation they need to do would be performed by a technology mostly invisible to us due to their own sophistication?
I would think more lower-tech "prime directive" ET's would first use sterilized robotic sample collection craft that would run the sample tests on the spot to send back the information. The likelihood of this happening in modern times is unlikely, as "the odds" are this would have happened long ago. Others would just be in full stealth mode.
For these reasons I'm also in disbelief with Stanton's comments about dissecting frogs in biology glass and that the aliens are just collecting data.
I have no doubt people are being "entity abducted" in their mind's eye by the millions every year. It's just that there is no ET-UFOs in the flesh in the "world of solids" we deal in when awake, since these events normally happen around sleep or during sleep paralysis. This phenomena has been going on since recorded history and before that too, but I just think it is interpreted in terms of current mythology.
There is such a thing as daydreaming or waking dreams or sleep walking or screen memories for trauma and abuse or DMT/Mushroom induced entity abductions or psychosomatic events (implants for example) or mental illness or brain dysfunction or hoaxing or fear fantasies. These events
in total happen
billions of times
every day, so there's bound to be some seriously perceived ET abductions everyday too.
There's a lot of big ufonaut shows made about collecting soil and water and that just sounds way too much like something we'd expect them to do, when really there should be a little more magic at work, no? If they're also busy waving magic wands and knockout gas at a distance then collecting soil and frying up saltless pancakes on the griddle just doesn't ring true.
Due to all the Human dysfunction I noted above this paragraph, then I think it is highly likely almost all these types of events are Human caused too. This does not mean many of these events are 'not real' to the person that experienced these events happening. Many of these people honestly believe it is happening and can pass lie detector tests too, so it is not mostly hoaxing or money making. It is just as likely though, that these events are happening beyond normal waking consciousness too.
The UFOs that leave absurd "turds" or trace materials or displays are very important to investigate fully. Trace information and documentation and sampling is critical to understand what is happening. Could those events be Human caused too? Just remember that Humans do "the absurd" everyday. There are at least two jokers in every deck of cards.
Who are all those wild cards? Zen Koans? UFO hoaxers? An ancient or recent religious cult or secret society of PTB? A military PSYOPS to test our reactions to a planned event?
If this was a common ET-UFO occurrence, then wouldn't there be some historical artifacts too? Where are those "absurd turds" or UFO "egg-laying" relics from the past?