Berarti orang ybs. akan dipindahkan ke penjara yang berlokasi di daratan Amerika Serikat (salah satu dari 48 negara bagian).

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Note added at 10 mins (2009-04-23 04:17:34 GMT)
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Atau dapat juga dikatakan "penjara di benua Amerika Serikat." Orang tsb. kemungkinan berada di luar negeri atau di Hawaii, Alaska atau salah satu wilayah AS seperti Guam atau Puerto Rico.

The term stateside originated as U.S. slang in the World War II era, meaning "to, toward or in the United States", usually spoken by a soldier or other U.S. citizen who at that moment was outside the country. If a serviceman was looking forward to a leave allowing him to visit home, he might say with enthusiasm: "I'll be going stateside next month!". After the war, Alaskans picked up on the usage to mean the 48 contiguous states, so that an Alaskan "going stateside" meant one who was traveling south to those states.

http://encyclopedia.thefreedictionary.com/

penjara yang dikelola secara lokal oleh negara-negara bagian... mengapa demikian, karena ada namanya penjara federal alias federal prison,

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Note added at 5 hrs (2009-04-23 10:05:49 GMT)
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We're trying to get you transferred to a State-side prison.

diterjemahkan bebas menjadi:

Kami mencoba memindahkanmu ke penjara lokal (atau silahkan dicoba menggunakan alternatif yang ditawarkan rekan2)