If a mistrial is called, then the offenses are still hanging over Carrizal’s head.
Not necessarily. A mistrial *caused by severe, intentional prosecutorial misconduct after jeopardy has attached* may result in the defendant walking free.
https://supreme.justia.com/cases/federal/us/456/667/case.html ;
http://www.txcourts.gov/All_Archived_Documents/ccaInformation/opinions/020102a.htm#N_1_