Among the stupider inventions that I've seen for toting a handgun around is the clamshell holster. When I mentioned that Season 3 of Adam-12 presented "the silliest floppy pivot holsters you've ever seen," I wasn't slamming articulated drop holsters as a whole-- just the ones these guys (and presumably all of LAPD, given the fervent attention to detail that Jack Webb put into his procedurals) had to carry. When you have to carry a full-sized revolver openly in uniform, a pivot is a mighty handy way to carry it in a drop holster format, so that it's fast to draw, but still easy to sit down with. None too concealable, but in uniform, that's not a concern.
Having never used such a contraption personally, I can say by looking at them that the problems with these clam shell holsters appear to be rife.
First and foremost, they pretty much demanded two hands or a lot more attention than should be necessary to re-holster. Friends, I'll tell you right now that being able to reholster one-handed and without unnecessarily-divided attention is one of the most important practical gun-related skills of police work. Smoothly securing your sidearm and efficiently bringing both hands to bear on the person whom you'd previously felt needed a gun pointed at is a skill that can keep a touchy transition from Going Badly Quickly.
Secondly, they flop so much that they seem to require two hands to open on occasion, and indeed that happens here, as demonstrated by Officer Reed*:
Officer Malloy, on the right, seems capable of drawing his revolver one-handed.
Note, too, that the spring-loaded clamshells spring open on hinges in the back. If the latch comes undone, the holster drops your gun on the ground. In most holsters, if the retention strap breaks, you can still carry your gun in it. These guys would have to put their gun in their pockets. Note how the holster, when the gun is drawn, is twice as big, and flops on one's hip like a stringer of fish.
Now, it's true that the holster protected the revolver from the elements, and covered the trigger guard. But... Elements? It was El Lay! They have the most consistently decent weather in the country!
Dumb. Somewhere, about the time I was born, a brass hat with LAPD made a goofball decision when those were ordered. I wonder how long they lasted?
*9:00 minutes in.