forensic files- lasting impression

there is something wrong with someone being a 13 year old and saying she is 19 years. they thought a girl was 19 but she was only 13. she was killed since people who did drugs thought the 13 year old girl stole cocaine. they killed the girl due to that. they found a piece of chewing gum. a suspect chewed the same type that was there at the site where the girls body was. gum can have a copy of people's teeth. this is interesting since people are unaware gum can do that. it was 1 of the only things that connected the people to the girl.