That is exactly what is happening, but not by subpoena. People who worked on the repairs (witnesses), stating depths of 6 foot voids in the main spillway, and 4 foot voids in the Upper spillway, are coming forward to others to get the information out there. These workers are afraid of retribution as they have asked for their names not to be revealed. But they are well known by the person who they revealed this information to. Scott Cahill has revealed this publicly, but is keeping the individual's names protected (i.e. people coming to him in confidence on the repairs & the details).
This also raises the question of the Independent Forensic Review Team. What will be in their reports? If there is supporting evidence that this "void filling" occurred, then they will need to address this evidence in their reports. OR will there be great pressure from DWR? OR will there be information that somehow is not "volunteered" to the Forensic Team?
Keep in mind the physical evidence has been pulverized in the recent blasting.
Tonight there is a Flood Warning for the next two days for the Merced River coming out of Yosemite. Similarly they have had terrible drownings in the Keweah River in Sequoia National Park (3 as of yesterday) and six on the Kern River which drains to the south starting in upper Kings Canyon Park, going through the back country of Sequoia draining the slopes of Whitney as it heads due south. The flow on the Kern is described as 400 - 600% of normal for this time of year.
I spent some of last week in Kings Canyon, Sequoia and the Central Valley and the rivers coming out of the central Sierras are really running. It had spiked up to the mid 90s at the first of last week and the rivers were running as though a flooding rainstorm had just finished.