Marie,
Well, I suppose that the technical answer would be to start with the ACA standards for adult detention facilities. But here in Chicago we have a wonderfully elegant alternative to the block-ish diagrams in the form of the (Federal) Metropolitan Correctional Center by Harry Weese - the same Chicago architect who brought you the Metro system in DC, among other masterpieces. It's a high rise downtown detention center, triangular in plan, part of the Chicago Federal Center that serves Mies van der Rohe's equally refined Dirksen Federal Courthouse.
Widely emulated, the MCC is entirely cast in place concrete - as an aside it's the most perfect finish in American CIP concrete you're likely to see - with vertical slit windows that have a taper to one side in section. While I've not compared them in the field to the current standard, I suspect that his approach gets a vision panel narrow enough to still meet the ACA or other applicable standard while providing a good amount of natural daylight for the interior. There are state, county and municipal detention and correctional centers all across the US that picked up on Harry's approach to cell windows.
If you want more specific information, contact Bob Theel who is the Chief Architect for GSA Region 5 (robert dot theel at gsa dot gov). Bob's a great guy, always willing to help - AIA plug; he's a colleague of mine on our board at AIA Chicago - and can give you all of the particulars, including the stuff you need a clearance for (which you probably already have).
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Eric Davis AIA, NCARB, LEED AP
President
Public Design Architects LLC
edavis@publicdesignarchitects.com www.publicdesignarchitects.com Oak Park IL
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