Realistic training works. In Operation Desert Storm, a reporter monitored the radio of tank brigade commander Lt.Col. Douglas Tystad. The federal government is active in local police training. The FBI, under the Justice Department, and the Federal Law Enforcement Training Center, under the Treasury Department, train local police free or at small cost. The course catalog is large, ranging from shooting to data processing to psychology.
Resources are limited, so the federal government trains trainers from local departments.
In practice, though not by law or formal arrangement, the FBI sets national standards for good police work. Excessive force hasn't been a separate course. It is covered under arrest techniques. Look for a new course in next year's catalog. The underlying idea is not to wait for 911 to ring, then respond.