Four major federal crime laboratories are those of the Drug Enforcement Administration, the Federal ...

Four major federal crime laboratories are those of the Drug Enforcement Administration, the Federal Bureau of Investigation, the Bureau of Alcohol, Tobacco, Firearms, and Explosives, and the _____ _________ _________ ___________.
 
  Fill in the blank(s) with the appropriate word(s).

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(Question #2) Goddard's work helped to establish the _____ ________ as the indispensible tool of the firearms examiner.
 
  Fill in the blank(s) with the appropriate word(s).

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(Question #3) The _____ ________ unit applies principles and techniques of chemistry, physics, and geology to the identification and comparison of crime-scene evidence.
 
  Fill in the blank(s) with the appropriate word(s).