What is the origin of the idiom "ambulance chaser" and when to use it?

The idiom "ambulance chaser" likely originated from the idea of lawyers literally chasing after ambulances to seek out clients. It has been used since the early 20th century and is generally used to criticize lawyers who are seen as overly opportunistic or unethical in their pursuit of legal cases. It has been used since the early 20th century and is used to disparage lawyers who are perceived as unethical or overly aggressive in seeking clients, particularly those who approach accident victims or their families shortly after an accident, injury, or tragedy has occurred.