Starting from the Ripley House, 4410 Navigation, Sheriff Adrian Garcia joins over 100 volunteers, law enforcement personnel, Sheriff's Office Explorers from various community service groups on a canvass of neighborhoods heavily impacted by such crimes as human trafficking. Sheriff Garcia is inviting the public to walk against this crime and download the quot;iWatchHarrisCountyquot; mobile app.br/ID: Sheriff Adrian Garcia shoots a quot;selfiequot; of himself and one group of volunteers canvasing the neighborhood near Ripley House.br/Saturday June 7, 2014 (Craig H. Hartley/For the Chronicle)