This is true. Most likely the same for Scientific Linux. Would you mind opening a ticket on github?

On Thu, Jul 30, 2015 at 2:40 PM, Bond Masuda <bond.masuda@hexadiam.com> wrote:
For rule id: ensure_redhat_gpgkey_installed, it appears to be looking
for /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release. I'm sure this works
fine for RHEL, but the CentOS content also references this same test,
which will fail since it should be looking for
/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 instead. Perhaps a slightly
modified version of the test is necessary for the various derivatives of
RHEL like CentOS?

-Bond
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