Does Critical Strike chance have a cap?
Crital Strike Chance has a cap at 100%. Useing some Demon Hunter abilities I was able to get my crit to 100% 
Then I used another skill that when equiped with a hand cross bow it should increase it by 10% more, but when it is used it stays at 100%
If the cap was any lower than 100% my ability would have stopped at the cap, if it was over 100% I would also been able to reach past 100%.
The game DOES cap at 100% with the DH passive, they will ALWAYS ALWAYS crit for 1 second. (I suggest spamming very hard hitting spells here)