Law Enforcement Trust and Integrity Act of 2018 This bill requires the Department of Justice (DOJ) to analyze existing law enforcement accreditation standards, recommend additional areas for the development of national standards, recommend the adoption of additional standards, and adopt policies and procedures to encourage accreditation of law enforcement agencies. It authorizes DOJ to make grants to federal, state, local, and tribal law enforcement agencies to obtain accreditation from certified organizations. The bill authorizes DOJ to make grants to state, local, or tribal governments, public and private entities, or consortia to study law enforcement agency management and operations standards and to develop pilot programs to address law enforcement misconduct. DOJ must study the prevalence and effect of any law, rule, or procedure that allows a law enforcement officer to delay the investigation and prosecution of law enforcement misconduct. The bill establishes, within DOJ, the Task Force on Law Enforcement Oversight to coordinate the detection and referral of complaints of alleged law enforcement misconduct. Law enforcement agencies must report data regarding practices on traffic violation stops, pedestrian stops, frisk and body searches, and use of deadly force. Data must include the number of incidents of each practice broken down by race, ethnicity, age, and gender of the officers, employees, and members of the public involved in the practice. DOJ must create a medallion for distribution to survivors of each law enforcement officer killed in the line of duty and memorialized on the wall of the National Law Enforcement Officers Memorial.