Pennsylvania State Police began using a device similar to a weather balloon in their weekslong search for a suspect in the killing of a state trooper last month.
Trooper Tom Kelly, a state police spokesman, said Monday the Ohio Department of Transportation donated the use of the large, unmanned Mylar balloon.
He says the device provides troopers with a similar level of technology and coverage at a fraction of the cost of traditional aircraft. It's also silent.
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Kelly says the balloon is experimental and among several technologies they're using in the search for 31-year-old Eric Frein.
Frein is charged with opening fire outside the Blooming Grove state police barracks on Sept. 12, killing Trooper Bryon Dickson and seriously wounding Trooper Alex Douglass.
Monday is day 45 of the search.