Which of the following is a secondary purpose of latent prints?

Establishing presence at a crime scene is a secondary purpose of latent prints because these prints can help link an individual to a location where a crime has occurred. When latent prints are found at a crime scene, they can suggest that a particular person was present, thereby contributing to the body of evidence in an investigation. This connection, while critical, is not the primary function of collecting latent prints, which is more focused on identification and matching to individuals through comparison with known prints.

Dependent on the context, other options lack relevance. Enhancing visual effects of crime scenes and creating misleading evidence do not align with the purposes of forensic print analysis, as the priority lies in accurate and reliable identification of individuals involved in a crime. Documenting crime trends typically involves broader data analysis rather than focusing specifically on latent print evidence, making it a less fitting choice regarding the secondary intents of latent prints.