Using biometric identification can have several advantages. Some are listed here:
Voting with biometric ID will do away with the problem of having double/multiple votes casted by the same person, which will make the polling process more fair and transparent.
It will also make the process more efficient since the data is stored digitally, it can be accessed more easily to verify the voter.
Makes it convenient for the electoral office workers and the voter alike, lesser waiting times.
Only legal and registered voters will be able to caste a vote this way so the laws will be complied with.
