I was changing some old light switches at a friend's house. The breaker panel wasn't labeled, so I did the bad thing, I tripped the breaker by shorting a hot line to ground. The lights went out, and I swapped out the 3 light switches. But along the way I got a bit of a shock. Sure enough, my tester showed the wires were still live, just not live enough to power lights.
The question - does a tripped breaker still leak a bit, or is this a symptom of a bad breaker? Once I identified the breaker and flipped it on and off, I couldn't detect any leakage.