The youth is on parole for a felony weapons violation in another county. His name has not been made public.
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TYC was required to inform Anderson about the student's criminal record within 24 hours of transfer.
The Austin American-Statesman reported Thursday that the school did not learn about the situation for a month and only because his records arrived, indicating he was from a detention facility.
A parole supervisor confirmed only that the student had been on probation for carrying a weapon in "places prohibited."