That definitely caused the ripple.
After that incident many LE agencies moved away from revolvers.
If I remember correctly, atleast 1 officer was found dead & it was obvious that he was reloading his revolver.
No. Two agents were killed in Miami. Miami was actually the incident that resulted in a focus being put on the ineffectiveness of 9x19mm and ultimately resulted in the adoption of the .40 S&W -- because a 9mm shot fell short of fight-ending penetration. Whether that was a good conclusion or not has been debated since. But Miami did not reproove the revolver. In fact, the Miami incident was ultimately ended by agent Ed Mireles with a S&W 686, shooting .38 Special +P. He shot both suspects dead, ending the fight. For the record though, Ed went on to greatly prefer a semi-automatic in .45 ACP, but adopted a .40 when his job required it. So despite his heroism with a wheelgun, he wasn't a fan of it.
It was Newhall in 1970 that called the revolver reload into question. CHP Officer James Pence was caught reloading his revolver and was shot dead (along with three other highway patrolmen.) There were a lot of critical procedural take-aways from Newhall. As far as equipment was concerned, the big takeaway was officers that carried .357 Magnum needed to train, practice, and qualify with .357 Magnum and not .38 Special. However, I think the CHP actually standardized on the .38 Special instead -- but afterward they trained, practiced, qualified, and carried the same ammo. Pence emptied his revolver without making any hits on two suspects. Officers Roger Gore and George Alleyn were also ineffective with their Magnums, making no hits.
I really encourage anyone to load up a Model 19 with .357 Magnum and try point-shooting (shoot from the 3/4 hip position, no sights) at a man-sized target 10 yards away. I've seen highly-trained experts totally flub it. But this is what the CHP was expecting Gore, Alleyn and Pence to do.
A once popular misconception about Newhall was that Pence was wasting time pocketing brass during his reload. This has proven to be untrue, but was a misunderstanding based on a subsequent directive for trainees not to pocket their brass in practice. There is no evidence that James Pence's reload was not excellent. Some have argued that he could have completed a partial reload more quickly. But he had already failed to make a hit with the first six. A speedloader almost certainly would have helped him, but they were not issued in 1970. Personally, I think he should have been issued a 1911. There was plenty of evidence as early as the 1920's that minimally-trained recruits performed significantly better with it than they did a double-action revolver. Pence was a very minimally-trained, 24 year-old rookie whose little training had involved a strict insistence that he
must not use the gun sights.
This cockamamie idea was a result of the bastardization of Fairbairn and Sykes doctrine by Rex Applegate who imported it into the US for the OSS and ultimately the FBI. Fairbairn and Sykes never espoused what the FBI adopted from Applegate, but the FBI's totally perverted version of "point shooting" influenced police agencies across the US. No evaluation of the effectiveness of the service revolver in the 20th century can be made without considering the effect of this doctrine.