Even in "controlled" studies they find ways to cheat. For example, when they use those "psychic ability" cards, with a square, circle, star, wavy lines, and a plus sign, if they get lucky and guess right on a hot streak for a while, they'll count that as evidence. But if they get on a cold streak for a while, they'll take a break and claim that their abilities have gone cold for a moment, and they don't count all those misses. Therefore, when you only look at the results of the hot streak with a vast majority of hits, it looks like they're guessing correctly well over what you'd expect by chance. Add in all the misses and their "ability" comes in at no better than chance. The proper way to do it would be to have a set number of cards, say 100 or so, and count every hit or miss. But when you have so-called psychics working with others who want to believe in psychic ability, they don't mind fudging the numbers.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.
