[...] Reames' approach is being taken a step further by researchers working at two of the Commerce Department's Boulder, Colorado, laboratories. Scientists there have developed a technique known as second harmonic magneto-resistive microscopy (SH-MRM) for forensic authentication analysis. It involves passing a tape hundreds or thousands of times over a high-resolution magneto-resistive head. The sensors in the head move back and forth over the tape without touching it, gradually building up, line by line, a topographic map of the tape's magnetic field at millions of points. The mapped data can then be plugged into an imaging program. If enough data is recovered, investigators can begin to rebuild the original signal.
Richard Nixon's Last Secret
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