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Refer to man:devfs.rules[5] for more information about this file.
Next, enable the ruleset in /etc/rc.conf:
devfs_system_ruleset="system"
And, restart the man:devfs[8] system:
# service devfs restart
Finally, add the users to `_usb_` in order to allow access to the scanner:
# pw groupmod usb -m joe
For more details refer to man:pw[8].