It's 2012. You can buy touch screens that don't need constant "calibration". These machines are using 1980s caliber technology when this was a constant problem. The last touch screen I've worked with that had this issue was CRT-based.
All these machines should do, presuming you need machines at all, is print out a receipt with the vote clearly indicated so that it can be deposited in a traditional ballot box. Leaving the tabulation a "trade secret" is really not a good idea.
