Everything required to intercept bitcoin payments is in place today, and almost worldwide. You can laugh now, but by the time this short post is finished you will realise the truth.. that bitcoin WILL fail, and not of it's own accord, but due to the fact that it is indeed a threat to any and all established currencies of the world, and hence a threat to those countries security.
Security? Do you mean that using Bitcoin would make parasite's life harder?
I am pretty sure what decksperiment is saying about being able to intercept bitcoin payments is not true. When a TX is sent the TX is signed with something that proves the holder of the private key actually signed the message. The signature is unique to, both the amount of bitcoin being sent as well as what address the TX is sending to (among other things).