Re: Britain solved this 'tech problem'
I'm afraid you may not realise that in fact you can vote in a UK election in person without flashing your polling card at the teller. Nice cushy job, I know from experience, but at £210 per day to sit and give out ballots its a piece of piss.
There is no requirement to show a polling card or any other form of ID to the teller.
Simply state your name and address at the polling station at which you have been allocated. The teller flicks through the register for that polling station, if there is not a line drawn through your name (a line indicates you have already voted that day and you will be refused a ballot paper) no line = ballot paper.
A person who attends a polling station and provides false details can be charged under electoral law for "Pesonation" - not impersonation as you would think is more apt.
The electoral commission, a paper tiger, presumably carefully crafted out of spoilt ballot papers with no teeth says the following
"In 2018, there was no evidence of large-scale electoral fraud.
Of the 266 cases that were investigated by the police, one led to a conviction, and two suspects accepted police cautions.
In 2017, there was one conviction and eight suspects accepted police cautions."
So there...... what could go wrong.... fill in the dots.
PS We has an elderly guy who came to the polling station three times to vote, we never reported him as a colleague also saw him visiting the a newspaper shop for the same newspaper multiple times a day. Bless him.
PPS Not that I would ever condone this, but if you really dislike the other candidate(s) on the ballot why not send them a message where you would normally place a cross?
Make sure you put a cross on the one you want (a tick is also acceptable). In the wee small hours your ballot paper will be put with other "questionable" papers and presented to the candidate and agents to agree on the voting intention, always great to see the faces of candidates who have been left a "message". By the way your vote is not secret. On receiving your ballot paper, the friendly teller will write the ballot paper number (on the reverse) against your name. Giving a clear indication of your voting intention.
The ballots after counting including the polling registers are sealed in their ballot box and popped under the town hall for a period of time to enable any subsequent legal challenge ( normally up to 21 days after an election result is declared) as to the validity of the election to take place.
To my knowledge a challenge on the grounds of validity is a rare occurrence