As the smartphone falls in price while its capabilities improve, it is becoming a valuable tool in the diagnosis of a growing number of diseases and ailments around the world. When Yonatan Adiri's mother fell down a bank and briefly lost consciousness when travelling in China, an initial diagnosis suggested she had a few broken ribs, but nothing more serious. Doctors were keen to fly her to Hong Kong for treatment. But Yonatan's father was worried and took photos of the CT [computerised tomography] scans of the injuries, emailing them to his son. Yonatan showed the images to a trauma doctor, who instantly diagnosed a punctured lung.

When police officers removed the mirrored doors behind which Yonatan Daniel Aguilar had died hours earlier, they found a crumpled blanket on the ground, obscuring his emaciated body -- pale and stiff, curled in a fetal position, with cuts on his face. One officer lifted a corner of the blanket and two cockroaches crawled out. The child was so tiny that officers thought maybe he was 6 years old or so. Details about the condition of Yonatan's body when it was found last month in his Echo Park home were disclosed in more than 100 pages of heavily-redacted case records and police reports released to The Times by the Los Angeles County Department of Children and Family Services this week. The records show that Yonatan's risk of abuse at home had been marked as "high" four times from 2009 to 2012 by a county program intended to guide social workers' level of intervention.