“Friedman has characterized the kinds of evidence, scientific and otherwise, that he considers to be relevant, which include evidence such as credible”.... source wikiapedia for what its worth which in itself is questionable)
...testimony (what people say)
...analyses of documents (what people write)
...video and physical trace evidence (what people film)
...multiple sources of mutually corroborating evidence of one or more kind. (what people say,..write..,..film)
Though these may be impressive to research and look at to those who believe there are aliens....still no one has presented an alien. They simply are not there.
Even THAT
is NOT true.
The case of the two skeletons found in Mexico--one a male--I forget how old and a woman. I don't recall if the human DNA matched the woman, or not. IIRC, the male was kind of lovingly cradled, held by the woman's skeleton.
The DNA of the male was half human and half TOTALLY UNKNOWN.
Also, the musculature fibers and bone fibers of the male were extremely different from human such.
IIRC, there have also been spontaneous abortions and maybe some chosen abortions wherein the baby was decidedly and significantly other than human--and in cases of abductions involving said mothers.
And, I know some debunkers have attacked Stan Romanek's case. However, I went into it quite wary and was impressed with his candor and with all the hard tangible evidence he had with him. I do not believe all his photos and videos are hoaxed by a long shot. Certainly his equations are not, either.
Seems to me there are a few other cases of ET critters showing up in one way or another for some kind of proof or other.
Regardless, when the critters are in public sight 24/7 and on the standard news channels day in and day out, I think you'll have to come up with another explanation.
BTW, the physical/trace evidence was dismissed overly quickly and unwarrantedly.
3,000-4,000 such cases with hard scientifically analyized and proven evidence is hardly nothing.