No idea about the ballot but here’s what a fraudulent voter faces in VA. I’d think a fraudulent voter would think twice about voting if challenged.
“The federal penalty for an ineligible voter found to have cast a vote could be a fine or imprisonment for no more than one year. Under Virginia law, it is a Class 6 felony for an ineligible voter to vote, punishable by not less than one year of imprisonment and not more than five years”
The time penalties are seldom imposed, I’d wager, or are so short they are hand slaps.