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Junk went out there. so the challenge was working through 130 years of trash and picking up the single .25-caliber automatic shell casing that we were looking for. >> modern metal detectors use computer processors to measure levels of conductivity. which enables them to identify the type of metal and the depth of the object underground. >> they are basically computers that can pretty well tell you what happens down there how deep it is. it does everything but dig for you today. >> hinks and his team found many shell casings, but none that were .25-caliber. then hinks got a signal near a clothe...

Told me that and i just kind of gave him a look, this was 15 years to try to find a shell casing in grass, and we are not sure of the exact area. but in this case, being the fact that it's murder, i'm willing to try any idea and it was worth a shot to do. >> police found help in nearby gettysburg, pennsylvania. don hinks known in these parts as a retailer who sells metal detector equipment. these metal detectors were often used to unearth military artifacts. >> i went out and found three french and indian war cannon balls and one whole on the braddock campaign, that probably gave me a bigger h...

>> but there was so much trash out there, so much farm equipment, this is the place where they would throw the garbage along with the tin foil and toothpaste tubes and all the junk went out there. so the challenge was working through 130 years of trash and picking up the single .25-caliber automatic shell casing that we were looking for. >> modern metal detectors use computer processors to measure levels of conductivity. which enables them to identify the type of metal and the depth of the object underground. >> they are basically computers that can pretty well tell you what happens down there...

>> but there was so much trash out there, so much farm equipment, this is the place where they would throw the garbage along with the tin foil and toothpaste tubes and all the junk went out there. so the challenge was working through 130 years of trash and picking up the single .25-caliber automatic shell casing that we were looking for. >> modern metal detectors use computer processors to measure levels of conductivity. which enables them to identify the type of metal and the depth of the object underground. >> they are basically computers that can pretty well tell you what happens down there...

>> when mr. nelson originally told me that and i just kind of gave him a look, this was 15 years to try to find a shell casing in grass, and we are not sure of the exact area. but in this case, being the fact that it's murder, i'm willing to try any idea and it was worth a shot to do. >> police found help in nearby gettysburg, pennsylvania. don hinks known in these parts as a retailer who sells metal detector equipment. these metal detectors were often used to unearth military artifacts. >> i went out and found three french and indian war cannon balls and one whole on the braddock campaign, th...