"These are national security assets: evidence gathered
here will never be used in a drug case, or a tax evasion
case."
The evidence gathered doesn't need to be used in a drug case directly in order to provide value. The information being collected is sufficiently broad and inclusive to give law enforcement more than enough leads they would not have already had. The discovery process required to determine if such a system were misappropriated for anything more than these national security concerns would be overly burdensome for any defendant in a court of law, especially when said defendants are spending every penny on just trying to remain free.
