. >> reporter: we're at the city morgue with monessau kylie who's from canada originally, now part ofeam of archeologists who help identify victims often dismemm dismembered in unmarked graves. >> you do get desensatized especially in el salvador, there's death all around us. we're used to this. >> reporter: this is a brisk, efficient processing center for human misery. one technician tells us they see an infinity of death. every day families come to the morgue to search for the missing and to identify and collect the dead. we meet ara, her 17-year-old son, alexis, was killed last night. just two months ago, one of her other sons was murdered by the gangs at which point she applied for asylum in america for her family. she's still waiting for a response. ♪ >> reporter: coming up, she invites us to her son's wake where we are completely unprepared for what happens next. and we will meet a teenager who escaped the gangs by fleeing to america, where he is now fighting to stay. if you have moderate to severe rheumatoid arthritis, and you're talking to your doctor about your medication...