Why do 3 letter agencies need special tools? Who will they be accountable to that these tools are being used ethically? We already have a bunch of stories of c

Why do 3 letter agencies need special tools? Who will they be accountable to that these tools are being used ethically? We already have a bunch of stories of crooked cops using databases to stalk love interests, etc. Then look at the Michael Hastings incident. Imagine how much abuse goes unreported.