actually its easier for a right-hander to pick someone off at first, the snap throw to first is much easier then throwing across your body, its a dead give away and you would never pick anyone off as well as its a longer throw, but thats not the reason why catchers arent left handed. Throwing to 3rd would be easier/snap throw for a lefty then a righty.
While this isnt necessarily true, I believe these are the 2 strongest reasons I have always felt as why there are no left handed catchers.
1) When setting up behind the plate your glove hand foot (if that makes sense) is slightly in front of your throwing foot, and your glove hand being out gives you a slight angle to see the runner in your perephrial (spelling) vision. A lefty on the other hand would have his body slighty skewed towards 3b blocking that 1st base vision.
2) Lefties generally cant throw straight. Their ball always sails back to the left. Considering that the throw to second has to be the most "straight" throw in baseball, it is something else to consider. Lefties would tend to sail the ball towards the shortstop side of the bag, where as if it sails from a RH catcher it would goto the second base side of the bag and still give an opportunity to make a tag up the line
These are both my theories and are up for debate, but they seem pretty reasonable to me
ps I am lefthanded and caught into college ranks and those were my problems primarily
I posted this in the other thread originally