By draw two parallel lines across the left hand corner of the cheque, this crossing can prevent the cheque from being directly encashed. The crossed cheque must be deposited into a bank account. If the cheque has been stolen, it is easily traced by locating the account it was deposited into.
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http://bemoneyaware.com/cheque.php
http://www.bankingonly.com/article_details.php?article_id=17