Dear Ms May
Our major concerns with Terrorists and Paedo's is the risk of being falsely labelled as one by some ignorant civil servant snooping on our private conversations and jumping to the wrong conclusion.
Might I suggest a read of the badscience.com website and that you educate yourself and your flunkies on the likelyhood of false positives when there are a very small number of actual villains? ie you will ruin far more innocents lives than catch criminals.