Walmart will begin to deliver groceries inside customers' homes soon. Walmart is working to reduce checkout theft in more than 1,000 U.S. stores with the help of cameras powered by artificial intelligence. The retailer began investing in the surveillance program, dubbed Missed Scan Detection, several years ago in an effort to combat shrinkage -- loss due to several causes including theft, scanning errors, waste and fraud, a Walmart spokeswoman told Business Insider. "Walmart is making a true investment to ensure the safety of our customers and associates," Walmart spokeswoman LeMia Jenkins told the business site. "Over the last three years, the company has invested over half a billion dollars in an effort to prevent, reduce and deter crime in our stores and parking lots."