What & Who discovers terrorist plots?

[davidbfpo]

The reverse of telling the authorities. A mother in Birmingham (UK) whose son left for Syria and died there fighting with ISIS:

The clues were difficult to decipher; their contexts always allowed for other, perfectly innocent explanations.....With hindsight, I should have questioned more his distancing of himself from his usual social group — and, possibly, the watchful eye of his father. Naïvely, perhaps, I had passed off the changes in Rasheed as his exploring and forming an identity away from his parents. It was the biggest mistake and regret of my life. But ask any parent of teenagers: Would you have done better?

Link:https://www.nytimes.com/2017/07/08/o...dist.html?_r=0

The mother told the police he had gone to Syria and went onto found a group to help families in such predicaments.