>> reporter: on the other end of that phone call, britney samora, their son's sixth grade teacher atlementary school. >> why do you say that? >> reporter: not long after she was arrested. >> body cam on him as well -- >> reporter: the 27-year-old pulled over and put in handcuffed. charged with sexual abuse after allegedly carrying on a secret relationship with one of her students. >> did you have an inappropriate relationship with a 13-year-old boy? one of your students? >> reporter: it wasn't that trove of handwritten notes that would uncover the alleged abuse. instead, the boy's parents discovered illicit cell phone conversations by using a free app called sentry. it monitors key words and one day flagged repeated use of the word "baby." >> i saw at the bottom that it had mrs. zamora instagram profile. i told my husband and we looked it over. >> reporter: dad confronted his son. the child explaining during this interview with investigators which was blurred to protect his identity -- >> he came home and he was all like, who are you chasing? and then he showed me the text. and he li