I think this is impossible but hypothetically you could fiddle with the EMI signature of a product to make it easier to sniff for. Actually adding a component

I think this is impossible but hypothetically you could fiddle with the EMI signature of a product to make it easier to sniff for. Actually adding a component is a bit too james bond, although maybe you could do 1 or 2 on some enormous board but even then that's a real stretch.