Permissions and rights for security professionals inside organizations

["acrypto" <acrypto () comcast net>]

A policy and or procedure question: 
I am curious to know what levels of access security professionals are
granted inside organizations. Should the security team maintain
administrative and root type access for all systems? Should there be a
process by which they can obtain this level of access at any time if
they don't maintain it constantly? Should security professionals be
limited to only read access but to all data? Or, should security
professionals only have access upon request for any system, data, or
resource? Are there any policies or best practices that address this
issue?  

Thanks in advance for any insight you can provide,   

acrypto  


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