Few stories have the power to captivate us more than those that remain unresolved. Codes, puzzles and cryptic public art tease us with their intrigue: Why is their message coded? What great secrets might they hide? Despite the efforts of our most learned historians, cleverest cryptographers and most determined treasure hunters, history is replete with riddles that continue to confound us today.
Here are the SWAT documents one police agency wanted kept secret