An expert in forensic dentistry says the single tooth and parts of a jawbone found in Donald Blom's firepit are those of Katie Poirier. Blom is charged with abducting and killing Poirier last May. The prosecution is trying to build its case against Blom hampered by the fact it has very little physical evidence. Minnesota Public Radio's Stephanie Hemphill reports. { Testimony in the trial this week is focusing on the tiny bits of evidence found in the firepit on Donald Blom's property just outside Moose Lake. Forensic odontologist Dr. Anne Norlander told the court she believes "to a reasonable degree of medical certainty" the bone fragments and tooth found there belong to Katie Poirier.