As the central government began easing enforcement of the policy in the early 2000s — before ending it in 2015 — reported abductions fell sharply. Technological advances such as a nationwide DNA database of missing children, stiffer criminal penalties and greater public awareness of child trafficking have also helped curb the problem, said Zhang Zhiwei, executive director of an anti-trafficking center at the China University of Political Science and Law.
Still, the threat of abduction continues to weigh on many Chinese. On Monday, several police departments in the eastern city of Hangzhou issued statements denying viral rumors about attempted kidnappings.
Mr. Guo’s son, named Guo Xinzhen at birth, disappeared on Sept. 21, 1997. He had been playing at the door of his home while his mother cooked inside, according to interviews the elder Mr. Guo has given over the years.
A frantic Mr. Guo and his wife, along with family, neighbors and friends, fanned out across the region to search for the boy. But after several months, the effort waned. That was when Mr. Guo attached large banners printed with his son’s photo to the back of a motorcycle and set out to find the boy on his own.
“Son, where are you?” the banners said, alongside an image of the boy in a puffy orange jacket. “Dad is looking for you to come home.”
Over the years, Mr. Guo wore out 10 motorcycles, traveling from Hainan in the south to Henan in the north, chasing down any tidbits of information, he has said. Once, on a rainy day, a rock slipped off a truck bed in front of him, sending his motorcycle toppling. He had so many near-miss traffic incidents that he lost count. But he always set out again.