Genetic genealogy can also be used in criminology and law enforcement — it has even helped solve cold cases in this field. DNA samples from crime scenes can be uploaded to genetic databases to identify relatives of unknown suspects, which narrows down the search.3 After this is done, traditional genealogy methods can be used to build family trees from the matches until the most likely suspect is identified. In some cases, all it takes is for one distant relative of the suspect to upload their genetic results to genealogy sites for a case to be solved after decades of silence.