yosemite national park. the collision demolished both cars and claimed the lives of three secret service agents. the question facing investigators was why? within two hours, a special unit of the fresno, california, highway patrol called the multidisciplinary accident investigation team, or mait, arrived at the scene. >> their job is to take a look at everything that's there, document it, classify it, photograph it, and then use it later in the reconstruction process to develop a model as to how the vehicles were moving. >> the investigators found the point of impact marked by scattered debris, a pool of brake fluid, and more than a dozen gouge and scrape marks. they also found a set of skid marks 64 feet long. they began in sergeant sinclair's lane, crossed the yellow center line, and ended in