A TDCJ refers to a Texas Department of Crimainl Justice number isuued to a prisoner. This number holds all the information about each individual prisoner.
The SID refers to the State Identification number.
If it is correspondance you a looking for, then using either or both numbers will be enough. If you don't have either, then try this search site.
http://168.51.178.33/webapp/TDCJ/index2.htm
Hope this helps.
Dave.
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