In a statement released yesterday, Kappa Sigma said an investigation of a member's prank calls to a MEChA member confirmed the calls were accidental.

Michael Herskovitz, Kappa Sigma member accused of making the prank calls along with roommate Dylan Oster, completed and passed a lie detector test. The test determined that Herskovitz was telling the truth when he said he made only two calls, which were traced by police Feb. 5.

Roberto Martinez, MEChA member who received the calls, contends he received four calls.

As researched by the U.S. Department of Defense, polygraph examinations are 95 to 98 percent reliable, said Floyd Lawrence, president of Southwest Polygraph.

Herskovitz declined to comment, except to say that the situation has already been discussed.

Martinez could not be reached for comment yesterday.

There are three parts to a polygraph examination: questionnaire, pre-test interview and the polygraph test, Lawrence said.

Two rubber tubes across the chest measure respiration. Electrodes at the fingertips monitor perspiration, and a blood pressure cuff measures heart rate, Lawrence said.