Some certificates you need are Criminal Justice Commission for Credible Leadership Development, American Board of Criminalistics and National Association for Search and Rescue.

Additionally, after graduating from a police academy, aspiring detectives must continue developing at least three years of experience as pThe best degrees for becoming a detective include a bachelor's degree in criminal justice, criminology, psychology, or forensic science. A degree in accounting or computer science can also be highly valuable for specific types of investigations, like financial fraud or cybercrime. While not always required, a degree provides essential skills in critical thinking, problem-solving, and written communication, and can help with career advancement within a law enforcement agency. 

police officers before being promoted to detective. To be promoted, officers must complete an exam and/or be evaluated based on their service within the police department.

||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Personal Certified Investigator (PCI).