As in many districts this year, 20% of fourth- through eighth-grade teachers' evaluations will be based on an analysis of the change in students' test scores year-over-year.

WSJ: Cheating Claims Rock Long Island

To avoid that issue, Dr. Muller envisions the technology as part of a strategy in which people would first be identified as at risk through a genetic test and a noninvasive imaging test such as a CT scan before being referred for the spectroscopy analysis.

WSJ: Predicting Who Will Have Heart Attacks