Border patroman BILL JORDAN told an interesting story from many years ago.
A BP agent shot at a smuggler crossing a small footbridge after the smuggler fired two shots at the BP agent. The smuggler then dropped his pistol in the river and fled back into Mexico.
The bureaucrats in the BP decided to persecute this BP agent. They went to the foot bridge to examine the scene when someone in Mexico started shooting at them. They retired to the courthouse.
That night Bill Jordan went to the footbridge to examine it and while doing so he leaned over and a cheap .22 pistol with two shots fired accidentally fellout of his shirt pocket.
Several days later a magnet was dropped into the river to try and recover any evidence. About four or five cheap .22 pistols with two shots fired were recovered.
Case dismissed.
Yet that brings up questions. For instance, in Ramos and Compeans case, why would veteran officers who had never fired (in the case of Compean) their weapons in non-training situations suddenly do so? And the same agents who had never shown any dispensation to do harm to anyone suddenly change their manner of human interaction?