The question is why doesn’t someone get the card from the voter on the way out as voters used to have to drop off their ballot.

If so, that adds another level of complexity to any fraud attempt.

The smartcards are programmed for each individual voter and reused many times. When the Judges in the Precinct confirm the eligibility of each voter, a smartcard is programmed and given to the voter for use in a touch-screen machine. After the voter has cast the ballot, the smartcard is automatically reprogrammed to prevent the voter from voting more than once. In fact the card will be rejected if a voter tries to cast another ballot.
Since the smartcard is in the voters hand it is not surprising that some will walk out of the polling place. It is however, difficult to see how this card could reasonably be used again. This is because the person attempting fraud with this card would have to be able to do the following 1)reprogram the card with specialized equipment 2)Know the proper code for the precinct (each precinct is different and some may have 2 or more codes) where they are going to use it 3)get past the Election Judges to gain access to a machine 4)find a way to make the number of voters and the number of ballots cast agree. These 4 items are big hurdles to overcome. It would be easier to vote as someone else than to use a lost smartcard.

In other words, this is a rather implausible way to commit voter fraud. Keep it simple stupid applies here too.