What is the meaning of the word trace in this sentence

Verb1.

find or discover by investigation."police are trying to trace a white van seen in the area"synonyms:track down, find, discover, detect, unearth, turn up, hunt down, ferret out"police hope to trace the owner of the vehicle"2.

copy (a drawing, map, or design) by drawing over its lines on a superimposed piece of transparent paper.synonyms:outline, map out, follow, sketch out, delineate, depict, show, indicate"the analysis traces the origins of cowboy poetry"
noun
1.a mark, object, or other indication of the existence or passing of something."remove all traces of the old adhesive"synonyms:vestige, sign, mark, indication, evidence, clue; More2.a very small quantity, especially one too small to be accurately measured."his body contained traces of amphetamines"