text: Appendix I
  Figure I-4. Box method for determination of number of footprints.
  STAINS
  I-15. One obvious example of staining is blood on the ground or foliage. Other examples include mud
  dragged by footgear and crushed vegetation on a hard object. Crushed berries also cause stains, and,
  finally, the movement of water makes it cloudy.
  EFFECTS OF WEATHER
  I-16. The weather may help or hinder the tracker to determine the age of signs. Wind, snow, rain, and
  sunlight all affect tracking. Assess recent weather aids in determining the age of a track. A tracker can use
  the last rain or strong wind as a measure to show the amount of time it has been there.
  LITTER
  I-17. A poorly disciplined unit leaves a trail of litter.
  DECEPTION TECHNIQUES
  I-18. Deception applies when the followed party tries to slow the tracker by, for example, leaving false
  trails, walking backwards, brushing out trails, splitting up, fading out, fanning out, and walking over rocky
  ground or through streams.
  INTERPRETATION OF COMBAT INFORMATION
  I-19. The tracker makes a mental image of his quarry based on his learned concepts. When reporting to
  the commander, he reports what he believes, but should not state it as a fact. The commander considers the
  facts alongside the tracker's beliefs and any other information he has.