How many potentional terrorists have TSA Agents caught by patting them down?

I work in the homeland security field in the airport. I take dangerous objects form people every day. Not everyone carrying dangerous materials would I consider a terrorist, but I will say, people are stupid and try to get through with things like knives, cork openers, fertilizer, big batteries, etc. Another thing I see is smokers forgetting they have cigs and lighters in their pockets. I honestly think people try to test the system some times, but as far as preventing a high jacking? It's hard to find intentions of people some times, but I know not everyone out there is trying to crash a plane with a full bottle of pepsi in their bag =)