Digging under abandoned houses in Mexico's Jalisco state, Jose Servin has been searching for his son's remains since 2018.
He is just one parent to have lost a child to the country's powerful drug cartels, and for whom old wounds have been reopened by the recent abduction of five young friends in the Jalisco city of Lagos de Moreno.
Aged between 19 and 22, they are believed to have been tortured and killed by cartel members in a state that has registered 15,000 missing persons since 1962, the highest in Mexico.