Most election laws prohibit machines to be connected to Wi-Fi or Bluetooth other than designated machines equipped with modems to facilitate rapid uploading of results. Unfortunately, this method of reporting also permits hackers to enter the system. Hackers are also able to collect real-time information which could be used to determine how many additional votes would be needed to alter an election outcome.
This report from NBC news confirms this result. 'Online and vulnerable': Experts find nearly three dozen U.S. voting systems connected to internet (nbcnews.com)
The three largest voting manufacturing companies — Election Systems & Software, Dominion Voting Systems and Hart InterCivic have acknowledged they all utilize modems in some of their tabulators and scanners. Why? So unofficial election results can more quickly relayed to the public. As modems connect to cell phone networks, which, in turn, are connected to the internet. (from NBC News report)