PERRYVILLE — Polygraph tests have long helped police agencies determine if suspects are telling the truth. But Perry County, Mo., detective Brian McCain is convinced voice analysis is even more accurate.
Perry County law enforcement officials use voice analysis during investigations
Monday, August 23, 2010 | 1:08 p.m. CDT;
updated 8:56 p.m. CDT, Monday, September 27, 2010
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