Deech, Michael Shackleford, the Wizard of Odds, contacted Rob Singer after reading this article by John Brokopp:
https://www.google.com/url?sa=t&rct=...9v8fm3ZeoZJi76
Shackleford was concerned about machines being non-random that under Nevada law are supposed to be random. Singer supposedly had evidence that when holding two pair, a four flush or an open ended straight, the 5th card, when thrown away, would come back the same rank as the card thrown away an indordinate amount of times. In a random game the card will come back the same rank just 6.38% of the time. By the stats Singer showed it was coming back the same rank 47% of the time. Shackleford, a degree'd mathematician knew that was 115 standard deviations from the norm and quite impossible unless machines were non-random. And if it were true it would have been exposed long before Rob Singer. It would have been to noticeable for everyone to ignore. There would have been a huge clamor to Nevada Gaming about it.
I don't know how much you know about Singer but he is always coming up with these kinds of outlandish claims. Both Shackleford and the Administrator of Video Poker Forums did tests with Singer present and the results came in where they were supposed to.
Most likely, Singer's encounter with a mathematician of Shackleford's pedigree gave him a clue that 47% was just to outlandish of a claim so he lowered it to 18% with Mendelson.
Anyways, no one but Singer has ever made such claims.