Clemente Rodríguez has been documenting the long search for his missing son with tattoos. First, it was an ink drawing of a turtle — a symbol of 19-year-old Christian Rodríguez’s school — with a smaller turtle on its shell. Then, an image of Mexico’s patron saint, the Virgin of Guadalupe, accompanied by the number 43. Later, a tiger for strength and a dove for hope.”How else is my son going to know that I have been looking for him?” asked Rodríguez. To the heartbroken father, the body art is evidence that he never stopped searching — proof he could perhaps one day show to his boy.On Sept. 26, 2014, Christian Rodríguez, a tall boy who loved to folk dance and had just enrolled in a teachers college in the southern state of Guerrero, disappeared along with 42 classmates. Every year since, on the 26th of each month, Clemente Rodríguez, his …