How do I prevent a specific user from being able to 'su'?

Solution Verified - Updated -

Issue

On occasion it is necessary to be able to prevent specific users from being able to carry out one or other of the following:

1. Prevent a certain user from performing an su at all.

2. Prevent a certain user from carrying out an su to a specific destination user.

Environment

Red Hat Enterprise Linux (RHEL) 5
Red Hat Enterprise Linux (RHEL) 6

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