When Dave Grimstead left the police after more than 30 years, he knew just what he wanted to do: solve some of its most intractable mysteries. The founder of Locate International explains why the country needs him and his volunteers When it comes to cold cases, crime dramas get a lot wrong. “In reality, you’d never reach the end in nine neat episodes, all wrapped up, with a timeline that moved nicely along, building tension,” says Dave Grimstead, who spent more than 30 years in the police. Real