How can non-root users can run tcpdump or Wireshark or use libpcap?

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Issue

Non-root users can not run tcpdump or Wireshark.
Non-root users can not open RAW sockets
How can non-root users can run tcpdump or Wireshark or use libpcap?
How can an unprivileged user perform a packet capture?

Environment

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5

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