What is the difference between police investigation and police reform

Explanation:

Police Investigation:

a criminal investigation is an applied science that involves the study of facts that are then used to inform criminal trials. A complete criminal investigation can include searching, interviews, interrogations, evidence collection and preservation, and various methods of investigation

Police reform:

The history of law enforcement in the United States includes many efforts at police reform. Early efforts at police reform often involved external commissions, such as the Wickersham Commission, that spelled out reforms but left to the police to implement them, often with limited success.