An expert from the state bureau of criminal apprehension crime lab told jurors the Donald Blom Murder and kidnapping trial today the lab was unable to find any fingerprints or DNA evidence linking Donald Blom to the diappearance of Katie Poirier. During cross examination defence attornies hammered home the lack of physical evidence in the case. Minneasota Public Radio;s Stephanie Hemphill reports from St Louis County Courthouse in Virginia.