Sigh....design a test and specify what would constitute a passing attempt, such as:
I will sit at a table in one room. In a separate room at least 50 feet away, my friend will sit at a second table.
An observer will be present in each room. A video camera will be present in each room to record the test. There will be no verbal, visual, or electronic communication between me and my partner. I agree that we each will submit to a scan to insure that we are not carrying any concealed communication equipment. Neither of us will have a cell phone.
Working with my observer, using a random method of selection, we will locate twenty-five target words from a dictionary. The words will all be nouns specifying some physical object. One method might be to roll three dice. The observer will turn to whatever page in an unabridged dictionary the dice indicate and will choose the first noun on that page that names a physical object. If the dice read 146, the observer will turn to page 146 in the dictionary and choose the first noun on that page.
When all twenty-five words have been selected, the observer will write them on cards, then shuffle the cards into random order. I will then draw the cards one by one and will mentally tell my partner what the words are. My partner will write the words down, one by one, on a sheet of paper with rows numbered from 1 to 25.
Only direct hits will count. If the word is "balloon," only the word "balloon" will count. A word like "ball" or "round" will be a miss.
I claim 100% accuracy. I agree that this test will be counted a success if, and only if, my partner writes down all 25 words in the correct order. Any other result will be counted as a failure.
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This is a sample, of course. Details would vary--the randomization method here isn't really very good, and it could be improved, for example. You would have to negotiate the exact terms with the JREF. This would be a preliminary test. If you passed it, you would then design a tougher final test.