Is technology used for identifying voters at polling stations (electronic poll books)?

Bahrain’sOctober 24 and 31, 2002 Legislative Elections

Preparedby
The National Democratic Institute for International Affairs

Page. 5

To deter the possibility ofcitizens voting multiple times in various centers, the government announcedthat voters would need to bring both their CPR cards and their passports to thepolling stations; upon a receipt of a ballot, the passport would be stamped asa control mechanism. Polling station computers could determine whether a voterhad voted in that particular constituency, but not in any others. By contrast,there were no general polling stations in the municipal elections, and voterswere only required to present their CPR cards.

Source: https://www.ndi.org/files/2392_bh_electionsreport_engpdf_09252008.pdf