Meter tampering is a problem in much of the developing world, and designers are building multiple detection mechanisms into their gear to thwart energy theft. Texas Instruments, for example, points out that one tampering scheme is to reduce or prevent current flow from either the live or neutral-meter sensor. To head off this problem, meter designers measure both lines and use the larger measured value to calculate the amount of electricity used. Other detection techniques include building in an accelerometer to detect meter movement, mechanical interlocks, and recording power interruptions with a time stamp from a real-time clock in nonvolatile memory.