trace
object or reference that serves as an indication or evidence of a crime
animal track
imprint left behind in soil, snow, or mud, or on some other ground surface, by an animal walking across it
footprint
impression of the foot in a soft substance such as sand or snow
hand- or footprint
printed impression of the human hand or foot
blood trail
a smaller or larger amount of blood
scent trail
dog skill
skid mark
mark left by the skidding of an object, often a tire