LA high school coach held over student sex By Samantha Tata, NBCLosAngeles.com A 27-year-old athletic assistant at Poly Tech High School was arrested Tuesday on suspicion of having an inappropriate relationship with a student, police said. Investigators found that Jose Rosario Alvarez was involved in a sexual relationship with a 16-year-old female student who attends an LAUSD school different than the one where Alvarez worked, police said. The relationship was conducted in person and over the Internet. Alvarez was booked for unlawful sex with a minor and is being held on $20,000 bail at the Metropolitan Detention Center. He has been removed by LAUSD pending further investigations by the district. Alvarez's arrest came the same day that a substitute teacher in the LAUSD and Inglewood Unified School District was sought on an arrest warrant in connection with sexual misconduct.