Stains investigated for link to trooper Blood discovered during the search for Pennsylvania trooper shooting suspect shooting suspect Frein do n't pan out , police say . one stain was blood , but not Frein 's ; the other was n't even blood . Frein is suspected in September 12 ambush of 2 officers , 2 of whom died . He may have been seen September 12 night , police say .
Stains investigated for link to trooper shooting suspect Frein do n't pan out , police say . one stain was blood , but not Frein 's ; the other was n't even blood . Frein is suspected in September 12 ambush of 2 officers , 2 of whom died . He may have been seen September 12 night , police say .