If I do what is listed in the wiki I get the following:
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craig@craig-debian:~$ lsusb
...
Bus 003 Device 007: ID 04f9:0435 Brother Industries, Ltd MFC-L2713DW
...
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craig@craig-debian:~$ sane-find-scanner
# sane-find-scanner will now attempt to detect your scanner. If the
# result is different from what you expected, first make sure your
# scanner is powered up and properly connected to your computer.
# No SCSI scanners found. If you expected something different, make sure that
# you have loaded a kernel SCSI driver for your SCSI adapter.
# Also you need support for SCSI Generic (sg) in your operating system.
# If using Linux, try "modprobe sg".
could not open USB device 0x2109/0x1822 at 004:003: Access denied (insufficient permissions)
could not open USB device 0x2109/0x0822 at 004:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0003 at 004:001: Access denied (insufficient permissions)
could not open USB device 0x046d/0xc21d at 003:006: Access denied (insufficient permissions)
could not open USB device 0x2109/0x4822 at 003:003: Access denied (insufficient permissions)
could not open USB device 0x8087/0x0026 at 003:004: Access denied (insufficient permissions)
could not open USB device 0x045e/0x00db at 003:009: Access denied (insufficient permissions)
could not open USB device 0x046d/0xc534 at 003:008: Access denied (insufficient permissions)
found USB scanner (vendor=0x04f9 [Brother], product=0x0435 [MFC-L2713DW]) at libusb:003:007
could not open USB device 0x046d/0x0892 at 003:005: Access denied (insufficient permissions)
could not open USB device 0x2109/0x2822 at 003:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 003:001: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0003 at 002:001: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 001:001: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0003 at 006:001: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 005:001: Access denied (insufficient permissions)
# Your USB scanner was (probably) detected. It may or may not be supported by
# SANE. Try scanimage -L and read the backend's manpage.
# Not checking for parallel port scanners.
# Most Scanners connected to the parallel port or other proprietary ports
# can't be detected by this program.
# You may want to run this program as root to find all devices. Once you
# found the scanner devices, be sure to adjust access permissions as
# necessary.
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craig@craig-debian:~$ scanimage --list-devices
device `brother4:bus4;dev3' is a Brother MFC-L2713DW USB scanner
device `escl:http://127.0.0.1:60000' is a Brother MFC-L2713DW (USB) flatbed scanner
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craig@craig-debian:~$ ls -l /dev/bus/usb/*/*
crw-rw-r-- 1 root root 189, 0 Aug 17 20:15 /dev/bus/usb/001/001
crw-rw-r-- 1 root root 189, 128 Aug 17 20:15 /dev/bus/usb/002/001
crw-rw-r-- 1 root root 189, 256 Aug 17 20:15 /dev/bus/usb/003/001
crw-rw-r-- 1 root root 189, 257 Aug 17 20:15 /dev/bus/usb/003/002
crw-rw-r-- 1 root root 189, 258 Aug 17 20:15 /dev/bus/usb/003/003
crw-rw-r-- 1 root root 189, 259 Aug 17 20:15 /dev/bus/usb/003/004
crw-rw-r-- 1 root root 189, 260 Aug 17 20:15 /dev/bus/usb/003/005
crw-rw-r-- 1 root root 189, 261 Aug 17 20:15 /dev/bus/usb/003/006
crw-rw-r--+ 1 root lp 189, 262 Aug 17 20:24 /dev/bus/usb/003/007
crw-rw-r-- 1 root root 189, 263 Aug 17 20:15 /dev/bus/usb/003/008
crw-rw-r-- 1 root root 189, 264 Aug 17 20:15 /dev/bus/usb/003/009
crw-rw-r-- 1 root root 189, 384 Aug 17 20:15 /dev/bus/usb/004/001
crw-rw-r-- 1 root root 189, 385 Aug 17 20:15 /dev/bus/usb/004/002
crw-rw-r-- 1 root root 189, 386 Aug 17 20:15 /dev/bus/usb/004/003
crw-rw-r-- 1 root root 189, 512 Aug 17 20:15 /dev/bus/usb/005/001
crw-rw-r-- 1 root root 189, 640 Aug 17 20:15 /dev/bus/usb/006/001
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dev/bus/usb/003/007
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craig@craig-debian:~$ getfacl /dev/bus/usb/003/007
getfacl: Removing leading '/' from absolute path names
# file: dev/bus/usb/003/007
# owner: root
# group: lp
user::rw-
user:Debian-gdm:rw-
group::rw-
group:scanner:rw-
mask::rw-
other::r--