This Mexican Senate website has an entry in it's 'Gaceta del Senado' that has a synopsis of proposed changes to the penal code published in both Spanish and English (see red wording that allows drop downs in the lower part of the webpage)

https://www.senado.gob.mx/64/gaceta_del_senado/documento/623...

"Ver Sinopsis :
...La Autoridad Penitenciaria deberá mantener también un expediente médico y un expediente único de ejecución penal para cada persona que ingrese al sistema penitenciario."

"Synopsis in English:
...The Prison Authority shall also maintain a medical record and a unique record of criminal enforcement for each person entering the prison system."

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Note added at 6 hrs (2021-02-14 16:04:42 GMT)
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A person's 'Expediente Único de Ejecución' "contains accurate and updated information on their personal and legal situation". The types of information it contains is listed on page 111 (or 106 of 158) of this United Nations Office on Drugs and Crime document. As well as the sentence, it includes biometric identifiers, transfers between custodial facilities, information on dependents, etc..

https://www.unodc.org/documents/mexicoandcentralamerica/2020...