merigian suspected phil was being poisoned. phil tried to recall anything suspicious about the time he spent with his partner, steve white. and then he remembered. every time he and steve had a meal or a drink together, phil's health deteriorated. >> i noticed it several times when we ate together. i would get sick afterwards. >> even more alarming, steve white was a chemist by training and taught chemistry at the local high school. as a final forensic test, dr. merigian gave phil rouss very specific instructions. >> i told him, don't cut your hair. and then i would be able to clip it and send it to a laboratory for analysis. >> when someone is exposed to poison, it goes through the body and is usually excreted. but it also gets deposited in the hair root at the time of the exposure. when the hair grows out, the shaft becomes an historic record of when the exposure took place. when phil's hair grew longer, a strand was sent for an icp test, which tests for 22 different metal components at the same time. the hair was cut into qu