https://en.wikipedia.org/wiki/Elizabeth_Wettlaufer
For every new bit of technology, there’s someone who finds a way to do stuff that the technology would never catch because the inventors of the technology never thought of the idea in the first point. Case in point, Elizabeth Wettlaufer is one of Canada’s most prolific serial killers. They in all likelihood wouldn’t have caught her if she herself hadn’t confessed at some point. She was a nurse in a nursing home who regularly killed her patients by overdosing them on insulin. Because of the nature of her patients, those deaths never aroused enough suspicion to be investigated by police.
Theory:

Healthcare CEOs seem to be doing well.
Yet another job taken by big holding companies and billionaires.
There’s estimated to be upwards of 50 serial killers currently active in the US today.
It is much harder to be a serial killer now, but police are still not great at their jobs and especially communicating across state lines. Hell, even communicating across county lines have proven to be too difficult for police to manage or care to do. This is one of the reasons serial killers target sex workers, queer people, and people of color the most - the broader public care less about these victims and the police don’t work as hard to solve their murders.
Additionally police are often the murderers themselves.
We all saw what happened to George Floyd.
Shit, the Golden State killer was a cop that operated with impunity for years. He was only caught because a relative used one of those DNA ancestry services.
There’s estimated to be upwards of 50 serial killers currently active in the US today.
Who’s coming up with that estimation?
The FBI along with others that study crime rates and methodology. Several universities have studied these homicide rates for example.
Who do you think would be studying this sort of thing?
50 and growing, with Kash on the job.

Who do you think would be studying this sort of thing?
Bored housewives addicted to true crime drama?
There’s people that study these things as a profession.
I was asking for you to link a source in an apparently not direct enough way.
Would you please link a source to this claim so I don’t have to just take your word for it?
I cannot find the FBI actually saying how many they estimated were currently active.
https://en.wikipedia.org/wiki/Murder_Accountability_Project
It’s an estimation made from the data of unsolved murder statistics mostly.
That’s why the stat is up to 50 and not a firm number.
Ice agents.
Philadelphia seems to have a new one every 10-15 years. Here is the most recent one to get caught. It is a developing story, We don’t even know how many victims yet. For more Philly serial killers, here is a wikipedia list.
The percentage of homicides that remained unsolved was sitting barely above 50% last I checked. That number goes up and down a bit but has overall been getting higher over time (worse) since the 1960s.
Your chances of getting away with being a serial killer have never been better. Especially if you target a poor urbanized area and/or minorities.
I’d guess that trend is more homicides being caught and recorded as such, even if they remain unsolved.
Could well be, I’m sure there were lots of poisonings and whatnot that earlier forensic science misattributed to natural causes.
But it could also be that murderers are getting more savvy too. There have been so many CSI-style shows, police procedurals, and so forth that it doesn’t take a great genius to know how to make it a lot harder for police to identify you. Like, if you made an untraceable “ghost gun” to shoot someone with, don’t carry it around in your backpack for days after shooting the guy. Sheesh, basic stuff.
They blame a lot of it on the shift to gang violence and detectives having less time allocated for crimes of that nature. Supposedly forensics and only comes into play at all in 10-15% of cases. Hard to decode everything as someone not in that world though.
Serial killers have access to the same internet as the police.