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MILWAUKEE - More than 50 Wisconsin law enforcement agencies have begun to rely on a voice analysis system as an investigative tool to detect lies, while other agencies argue the analyzer is no more accurate than a coin flip.
The system works by measuring tremors and stress through voice vibrations. Advocates say the analyzer is a cheaper, faster alternative to the polygraph, which records blood pressure, breathing and sweat. But opponents say the technology is unproven and reliable.
Police in Oak Creek credit the technology with their successful investigation of a March 15 double homicide in which two people were beaten to death with baseball bats. The suspect agreed to take the voice stress analyzer test, whose results suggested he was being deceptive. That wasn't conclusive by itself but the results helped detectives focus on him as the main suspect, police said.
"I think there was some doubt in people's minds that we had the right person. After we gave him the test, we got back on track and said, 'This is the right guy. Let's keep going,"' said Oak Creek detective Lt. John Edwards.
Daniel Kohlman, 38, of Franklin, was charged in late March with two counts of first-degree intentional homicide in the deaths of Margaret Meyer, 51, and Earl Meyer, 25. Lawyers entered a plea of not guilty by reason of mental disease or defect on his behalf March 28.
About 1,400 law enforcement agencies nationwide use the technology. The analyzer costs $13,069, including training, compared with $25,150 for the polygraph, according to National Institute for Truth Verification, the Florida-based firm that developed the voice stress device...
...But Cudahy Detective Dala Milosavljevic said the device has helped his department investigate cases ranging from thefts to homicides since 1998.
"I love it. If it could cook, I'd take it home with me," he said.
The Milwaukee Police Department has used polygraphs for about 30 years and may consider voice stress equipment in the future, said Brian O'Keefe, the deputy chief.
"I don't think there's anybody saying that the polygraph or voice stress analysis is going to be 100 percent accurate all the time," he said. "You can't go into court with either one of them."