Why is an user switching to the root account while executing 'sudo su - <other_user>' in Red Hat Enterprise Linux?

Solution Unverified - Updated -

Issue

  • sudo is not working correctly, it's switching only to root even though another user is specify:
[test_B@localhost ~]$ sudo su - test_user
[root@localhost test_B ~]#

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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