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"Furthermore, it is commonly agreed that policy and security forces should not routinely be inside (or even outside) the polling station, as this may have an intimidating effect on voters, especially in countries with a rather poor democratic tradition or in (post-)conflict situations. As a rule, the police should only be allowed to enter the polling station when asked by the chairman of the respective electoral commission to secure order. Of course, it should only be called when the situation could otherwise get out of control.
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