Need to see all LAPD crime scene photos held in City Archives per this article:
which says there are:
countless boxes tightly packed with everyday dimestore #10 white letter envelopes, sealed and cut in half to make a convenient open-ended pouch, each containing the forensic negatives for a single case. On most of the envelopes is a hand-written "Division of Report", or DR, number. The DR number uniquely identifies each case and often appears hand-written directly on the negatives. The name or initials of the photographer can also be seen on many of the negatives.
The earliest photographs in the collection date to 1925. The film used was large-format (4"x5") cellulose nitrate until sometime in the early forties when it was replaced with safety film. In the early sixties, the size changed to medium-format (2-1/4"x2-1/4") which was used until the mid-seventies when it was, in turn, replaced with 35mm.