They have been "found & studied", but the findings have been ridiculed, labeled "too much woo", rejected, & swept under the rug. The people who "found" it are labeled as hoaxers, incompetent, and/or lunatics, then it's back to "Why can't we find them?"
There's an ELEPHANT in the room! Why can't it be seen?
I think that the majority of us haven't been ready to see, but it seems that as the "veil" gets thinner, the blurry Sasquatch is becoming more clear. Maybe "discovery" is closer than we think. The findings are beginning to be taken a little more seriously, even though the woo is still there. Soon, maybe the woo will be recognized as merely better use of the brain.....
Here's a good video in which Dr. Igor Burtsev shares some of his recent findings from the US. There's also some discussion about the Ketchum study. I found it very much worth watching.