Following up for those interested in what the resolve was..
Turns out udev was doing this in /lib/udev/rules.d/70-acl.rules.
Disabling the ACL_MANAGE variable for the CDROM device section is what
was needed to avoid this behavior. I added my own rule in
/etc/udev/rules.d which disables it for good:
SUBSYSTEM=="block", ENV{ID_CDROM}=="1", ENV{ACL_MANAGE}="0"
--
cdrom device permissions escalated after gdm login
https://bugs.launchpad.net/bugs/667338
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