Safety notice and recall for the Fluke 1AC-I VoltAlertTM Voltage Teste
The testers can fail to give an indication of live voltage, resulting in the operator falsely believing the electrical power is off, posing a risk of serious injury or death from electrical shock or thermal burns.
http://www.fluke.com/Fluke/usen/support/safety/1ACRecall.htm
Non-contact testers aren't 100% reliable? Who woulda thunk it.