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Well large 8 -16 GB USB2 stick are < $100 now. IT departments who evenly minimally know their stuff install a product like Tier3 Huntsman - that examines all network IP traffic looking for all packet anomalies, viruses and inappropriate versions of software (detailed inspections down to the dll version and checksum reference and trace how they entered a network and where distributed) - in real time. We did this at a large bank and could instantly see life insurance agents coming into Bank branches and trying to connect with wrong or incomplete versions of Windows updates run, forbidden software, viruses etc basically everything and alert security whilst they were still in the branch.
Basically everything is discoverable to someone with even a modest budget, know how and the correct technologies to control their environment - be careful!
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