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To the west coast crime lab. >> to determine whether or not there was explosive residue present on some of the fragments that were collected at the scene. >> gunpowder, nitroglycerin? >> correct. >> then there was this. discovered on the fifth day of the investigation, the panel box door found 160 feet from the site of the explosion. >> about two feet wide, probably weighs somewhere in the neighborhood of 15 or 20 pounds. >> this we are the large hole is would be the bottom of the panel. >> the forensic scientists at the 80th continued their tests, hunting for bomb residue, dna, fingerprints. ...

>> reporter: most of these pieces were once part of the electrical box. >> you have washers. different types of hardware in here, screws, nuts, wire. >> reporter: other pieces just trash. but a few fragments, just a handful looked like they were pieces from a different puzzle. odd. >> cells from a 9 volt battery, galvanized steel that's been ripped apart. >> reporter: parker sent off the misfit bits and pieces to the west coast crime lab for analysis. >> to determine whether or not there was explosive residue present on some of the fragments that were collected out at the scene. >> reporter: l...

Gasoline, or nitroglycerin? >> correct. >> reporter: then there was this, discovered on the fifth day the investigation. the panel box door found 160 feet from the site of the explosion. >> about four feet tall, about two feet wide. probably weighs somewhere in the neighborhood of 15 to 20 pounds. this where the large hole is would be the bottom of the panel. >> reporter: the forensic scientists of the atf continued their battery of tests hunting for bomb residue, fingerprints, dna and all the while the detective david psalm was on peter moore's tail, waiting for him to make a mistake. did he ...

Odd. >> cells from a nine-volt battery. galvanized steel that's been ripped apart. >> parker sent these bits and pieces to the crime lab for analysis. >> to determine whether or not there was explosive residue present on some of the fragments that were collected out at the scene. >> reporter: like gun powder, gasoline, or nitroglycerin. >> correct. >> then there was this. discovered on the fifth day of the investigation. the panel box door found 160 feet from the site of the explosion. >> about four feet tall, two feet wide. probably weighs somewhere in the neighborhood of 15 to 20 pounds. thi...

Pieces were once part of the electrical box. >> you have washers. different types of hardware in here, screws, nuts, wire. >> reporter: other pieces just trash. but a few fragments, just a handful looked like they were pieces from a different puzzle. odd. >> cells from a 9-volt battery, galvanized steel ripped apart. >> reporter: parker sent off the misfit bits and pieces to the atf's west coast crime lab for analysis. >> to determine whether or not there was explosive residue present on some of the fragments that were collected out at the scene. >> reporter: like gun powder, gasoline, nitrogl...