Originally Posted by cyccommute

Your patient is wrong. Follow the link. If you want a highly technical explanation, follow this link. The only proviso is that you have to locate the wires on induction coil detectors. Paving can bury them. If I can detect the loop, I have a 99% success rate in tripping them.

The motion detector sensors are more difficult. You look stupid but waving your arms around like an idiot generally makes those work. Shining a helmet light at them works well too...in the dark of course.