A complex designation can pause the speedy trial clock when the scope of the investigation and the volume of evidence render it impossible for either side to prepare within the standard 70-day timeframe. In this instance, the investigation involved over a dozen agencies, resulting in hundreds of gigabytes of discovery. The full segment is available here:
https://www.cbsnews.com/minnesota/video/the-complexities-of-bringing-vance-boelter-to-trial/