@Stefan:  I think if a system uses NAS , which would allow a user being
able to capture netwok packets read files, the syste admin would not
allow capturing network packets as normal users.

You can still allow normal users to capture USB packets using wireshark
by setting the setuid bit on dumpcap and making this change permanent
using dpkg-statoverride as suggested in README.Debian:

      Note that capturing USB packets is not enabled for non-root users by using
      Linux Capabilities. You have to capture the packets using the method
      described in I./a., setting the set-user-id permanently using
      dpkg-statoverride or running Wireshark as root.

This opens a security hole on the system as detailed above.

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https://bugs.launchpad.net/bugs/893828

Title:
  Granting Wireshark capture privileges does not allow USB capture

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