Plot summary
With information that Ian provides, Henry is able to connect the militia's drone to the same arms smuggler that Elizabeth is trying to track down. Trap software helps the FBI locate the State Department employee who is altering the manifests for planes carrying the stolen weapons. Just as the mole is about to tell Elizabeth who hired him, his lawyer shows up and ends the interrogation. Elizabeth's team puts together a plan to reduce the market for rhino horns by advertising Viagra in Vietnam, hoping it will help end rhino poaching in Namibia. The lawyer reaches an agreement with the Justice Department to release his client in exchange for information; the mole is assassinated as they leave the building. Henry discovers that Ian is being drugged and intends to pull him out of the field, but is fired upon by militia guards when he goes to meet Ian.
Credits
Adapted from Wikipedia contributors, Madam Secretary season 3. HTML formatting and reference markers removed.