The Wireshark team has long warned us not to run Wireshark as root. However, since Wireshark 1.4 (between Ubuntu 10.04 and 12.04), they’ve raised the stakes. Wireshark no longer loads all its plugins and protocol dissectors when run by root, and it displays warning messages on the CLI and the GUI:
tshark: Lua: Error during loading:
[string "/usr/share/wireshark/init.lua"]:45: dofile has been disabled
Running as user "root" and group "root". This could be dangerous.