Disable sound for specific users

How do I disable sound for specific users?

Theoretically if the user's not in the audio group, he shouldn't have access to sound devices.
$ ll /dev/snd/
total 0
drwxr-xr-x 2 root root 80 Oct 2 19:30 by-path
crw-rw----+ 1 root audio 116, 2 Oct 2 19:30 controlC0
crw-rw----+ 1 root audio 116, 8 Oct 2 19:30 controlC1
crw-rw----+ 1 root audio 116, 7 Oct 2 19:30 hwC0D0
crw-rw----+ 1 root audio 116, 13 Oct 2 19:30 hwC1D0
crw-rw----+ 1 root audio 116, 14 Oct 2 19:30 hwC1D1
crw-rw----+ 1 root audio 116, 15 Oct 2 19:30 hwC1D2
crw-rw----+ 1 root audio 116, 16 Oct 2 19:30 hwC1D3
crw-rw----+ 1 root audio 116, 4 Oct 4 09:12 pcmC0D0c
crw-rw----+ 1 root audio 116, 3 Oct 4 10:13 pcmC0D0p
crw-rw----+ 1 root audio 116, 5 Oct 2 19:30 pcmC0D1p
crw-rw----+ 1 root audio 116, 6 Oct 2 19:30 pcmC0D2c
crw-rw----+ 1 root audio 116, 9 Oct 2 19:30 pcmC1D3p
crw-rw----+ 1 root audio 116, 10 Oct 2 19:30 pcmC1D7p
crw-rw----+ 1 root audio 116, 11 Oct 2 19:30 pcmC1D8p
crw-rw----+ 1 root audio 116, 12 Oct 2 19:30 pcmC1D9p
crw-rw----+ 1 root audio 116, 1 Oct 2 19:30 seq
crw-rw----+ 1 root audio 116, 33 Oct 2 19:30 timer

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