Fits what I saw back in the 70’s. BIL was a cop. Showed me his throw-down gun, wrapped in Saran Wrap. All the cops had one in their cruiser to plant if they were forced to shoot someone. Told me he was developing the “cop attitude” and was quitting. Explained that everyone who wan’t a cop was a “perp”, including me. You were either a criminal or were going to commit a crime.
It's probable that *no* drugs were found (despite media claims) in this bust because Goines was physically unable to fetch them from the cruiser and plant them, because of his gunshot wounds.
I believe (without evidence) that Tuttle's 357 revolver was also a plant, and that he was unarmed, and that the "gunfight" was actually a fratricidal three-ring circus triggered by the gunshot that killed the dog.
The TV series "Blue Knight" had an episode where the main cop, "Bumper Morgan", told of a popular officer was involved in a bad shoot. His friends planted a handgun on the perp. When the coroner turned the guy over, there was seven guns under the body.