That was tested positive by Steven Burmeister. However, a second T-shirt was involved in evidence on PETN. Another piece of evidence that consisted of PETN was a knife blade also consisted of NG. The back of the truck (claimed to be) carried 4,800 pounds or more of ammonium nitrate and fuel oil blended into barrels, with the barrels wrapped by a (device which explodes a bomb) cord. (many broken pieces of something destroyed) from the bombing scene (claimed to be) proved positive for NG and other compounds