The most common SELinux policy store names are strict, targeted, mcs, and mls. None of the names assigned to policy stores are fixed, though, so it is a matter of convention. Hence, it is recommended to consult the distribution documentation to verify what the proper name of the policy should be. Still, the name often provides some information about the SELinux options that are enabled through the policy.
One of the options that can be enabled is MLS support. If it is disabled, then the SELinux context will not have a fourth field with sensitivity information in it, making the contexts of processes and files look as follows:
staff_u:sysadm_r:sysadm_t
To check whether or not MLS is enabled, it is sufficient to see if the context, indeed, doesn't contain such a fourth field, but it can also be acquired from the Policy MLS status line in the output of sestatus:
# sestatus | grep MLS
Policy MLS Status: disabled...