During an investigation, many things must be considered. Aside from the physical evidence, and witness testimony, suspect criminal history also must be analyzed. The investigation must include past history and the Modus Operandi, “M.O.” for short.
N.F.P.A. 921 (2001 Edition) 220.127.116.11.6 – Extremism” addresses terrorism specifically. It reads:
Extremism-motivated firesetting is committed to further a social, political, or religious cause. Fires have been used as a weapon of social protest since revolutions first began. Extremist firesetters may work in groups or as individuals. Also, due to planning aspects and the selection of their targets, extremist firesetters generally have a great degree of organization, as reflected in their use of more elaborate ignition or incendiary devices. Subcategories of extremist firesetting are identified as follows.
(a) Terrorism. The targets set by terrorists may appear to be at random; however, target locations are generally selected with some degree of political or economic significance. Political targets generally include government offices, newspapers, universities, political party headquarters, and military or law enforcement installations. Political terrorists may also target diverse properties such as animal research facilities or abortion clinics. Economic targets may include business offices, distribution facilities of utility providers, banks, or companies thought to have an adverse impact on the environments. Fires or explosions become a means of creation confusion fear, or anarchy. THE TERRORIST MAY INCLUDE FIRE AS BUT ONE OF A VARITETY OF WEAPONS, ALONG WITH EXPLOSIVES, USED IN FURTHERING HIS OR HER GOAL…
It very clearly states the Terrorist may use explosives along with fire to further their goal.
It would seem to be a “no-brainer” that a true investigation would test for the possibility that “the terrorist may (have) use(d) explosives along with fire to further their goal.”
There is no excuse for refusing to test for explosives.