From the 60s-90s, there were many serial killers who were caught and put into custody. But then, it just kinda... stopped? I'm aware that the amount of serial killers is unknowable, but surely, with increases in forensic technology and surveillance, there would be even more caught. But there aren't. What happened?
Oh yeah, I do remember that, when I was a lib in college, I took digital forensics (I fucking hate the whole field now, I grew), and my ex-FBI professor did mention that she was on the case that arrested a Drexel University security guard that had an obsession with woman's shoes. He would steal woman's shoes, and write so many fantasies on his computer about killing women for their shoes. Once, he finally actually killed a woman for her shoes, but he got caught. He's probably textbook serial killer, and would likely have not stopped after his first victim had he not been caught. So there may be many more that never got the chance to become serial.