The phrase "is trail of" can be replaced with a variety of synonyms, depending on the context. For instance, "is evidence of" can be used when referring to a crime or wrongdoing; "is indicative of" is appropriate when discussing a trend or pattern; and "is the result of" is suitable when explaining a particular outcome. "Is the consequence of" may be utilized when discussing a preceding event or action. Additionally, "is a trace of" can be employed when referring to a faint or subtle indication, while "is a record of" is appropriate when discussing a documented history. Finally, "is a footprint of" could be employed when speaking about an impact or influence left behind.