Expense reports and client contracts are two types of documents that should not be left out for all eyes to see. Private corporate and proprietary information is the kind of data a competitor would love to get their hands on. Documents left out over night, when cleaning crews or other outside contractors may be in the building, are of particular concern.
(Do people really leave sensitive information lying around? Of course they do - we found violations right in CSO's offices. See our early-morning, snooping-around video version of the clean desk test.)
Takeaway: Put any sensitive paperwork in a locked file or drawer when you're not working on it.