Mithan Lal, 82, left home on April 27 for his daily morning walk. He never returned, apparently forgetting the way back due to Alzheimer’s disease. The story of 75-year-old Dwarka Prasad was similar. The anti-human trafficking unit (AHTU) of crime branch took up the two cases suo motu as a challenge and managed to trace the two men from different areas in Delhi after a sustained effort lasting a fortnight