If he violated and only got 90 days, he's lucky. Violators usually have to serve their time in the jurisdiction they were sentenced.
https://www.inmateaid.com/ask-the-inmate/my-boyfriend-was-on-parole-and-he-violated-he-was-told-that-he-was-recommended-for-90-days-isf-but-they-sent-him-to-tennessee-colony-beto-does-that-mean-he-was-sent-back-to-prison-to-finish-his-time#answer
Accepted Answer Date Created: November 12,2022