Yeah MK ultra involved some CIA agents just going around and roofying random or targeted people with LSD and various other substances while also tripping themselves pretty much just for the fuck of it. There was nothing scientific about it. Most of the notes that were taken were destroyed because they knew that if word got out about what they were doing, it would make a lot of people angry. Iirc, the evidence that was collected only still existed because one of the people running it had a bunch of them in his home when it was searched for other shady shit he was up to.