Every resident eligible to vote is assigned to a particular polling station close to their registered address, which maintains a list of all voters eligible to vote at that station. At the polling station, officials check the identification of voters to ensure that they are assigned to that particular station, check off their names in the list of voters for that station, and hand the voter an envelope. The voter selects the ballot slip of his or her party of choice behind a divider, places the slip into the envelope, then emerges from behind the partition to place it in the ballot box. Special polling stations are set up in hospitals, prisons, diplomatic missions abroad, military bases, women's shelters, and Israeli ships to enable medical professionals, patients, diplomats and their families, Jewish Agency staff abroad, soldiers, prison inmates and staff, sailors, and residents of women's shelters to vote. Polling stations with accessibility for the handicapped are set up around the country and police officers on duty may vote at any polling station. However, to ensure that nobody votes twice, as they are still assigned to a particular polling station close to their registered place of residence, they must vote with what are referred to as double envelopes. The envelope containing their ballot slip is placed into a larger envelope which also contains their identifying information so that it can be checked against the list of voters at their assigned polling station to see if they were marked as having voted there before their double envelope vote is counted. Aside from double envelope voters, all citizens may vote only at their registered polling place.