I haven't actually been able to parse a 0% crit rate with a huge sample size due to gear access. I put Van Pendant on (RDM/WAR) and saw I could still be crit hit, so I assumed there was a 1/128 chance left. Attempted to test with Warrior's Stone and got 0 crits, but lack of Phalanx also made them much lower sample size. More recently, my parse where I broke Spear of Trials on mandies as WAR/DNC with Warrior's Stone on showed monsters had a 0% crit rate, but I only took 600 hits or so. I could have just gotten lucky.
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