[Tilted Irish Kilt]

FOIL the NSA for copies of all written and phone/cell conversations of all the principals
If NSA can't/won't provide copies, then defund them for incompetence .
Then consider criminal charges for:
RICO - definitely organized and in conspiracy with others
International gun running and traficing - coercing stores to provide firearms to known "straw purchasers"
accessories to murder - since many murders in Mexico were attributed to these specific firearms, and lastly,
destruction of government property - destroying government documents, memos, and phone/ cell records.

[kitchen]

Note also that DoS has to approve all weapons exports.