Describe two situations in which a document examiner may be ...

[danielfitts88]

Describe two situations in which a document examiner may be prevented from coming to a positive conclusion about a questioned document.
 
  What will be an ideal response?

Question 2

___________ ___________ can be used to detect alterations to a document made with ink differing from the original and can also reveal writing that has been erased.
 
  Fill in the blank(s) with the appropriate word(s).

[Missbam101]

Answer to Question 1

Answer should include points such as the following:
 When an insufficient number of known writings are made available for comparison
 When the examiner receives questioned writings containing only a few words, all deliberately written so as to disguise the writer's natural style

Answer to Question 2

Answer: Infrared luminescence