Even a small act can effect someone/something in the future either negative or in a positive way.
Studies that use the symbolic interactionist perspective are more likely to use qualitative research methods, such as in-depth interviews or participant observation, because they seek to understand the symbolic worlds in which research subjects live.
The answer would be : by comparing the DNA from the test using the Kastle-Meyer test. Kastle-Mayer test is used to detect possible presence of hemoglobin in the DNA. This results could be compared to the Law enforcement's database to find out the one's who is involved in the crime scene
The ultimate goal was the overthrow of Castro and the establishment of a non communist government friendly to the United States