Vendor Flash Drives Bypass IT Security Restrictions

The author, a chemist, mentions that he often needs to transfer data between multiple PCs to install software and operate instruments from different vendors. He observes that USB flash drives provided by third parties, even if they appear empty, bypass IT security controls on ports/devices, allowing the use of these unauthorized drives. While this situation makes his work easier, he expresses curiosity about why these USB drives can so easily circumvent security measures.