A few vague footage, confirming that the bullet was from the ballistic test results of the same pistol, was one of the few clues that everyone could have at the moment, and soon the room fell silent, instead of the usual brainstorming of words and me.

It's actually a very uncomfortable feeling, waiting for the killer to continue the crime, waiting for a new body to appear, expecting the killer to make a mistake or take the initiative to contact the police, just like in the "Sam's Son" case and the "DC Sniper" case.

David Berkowitz, the murderer of "Sam's Son", took the initiative to write letters to the police and the media, and John Mohammed in the "DC Sniper" case not only made the phone call to the police that eventually led to his arrest, but also left letters and a tarot card at the crime scene.

In this way, they attract public attention and use it to taunt and humiliate the police, and after succeeding time and time again, these serial killers begin to see the killings as a game against the police, or a game of cat and mouse.

Now everyone at BAU, including Danny, Joyna, and Jack, is the one who has been humiliated, not only by the murderer's arrogant style of crime, but also by the guilt of the victims who have already been and those who can be expected to be in the future.

Because now they have no means to stop each other's recklessness.

"Ahem, Garcia used a digital coordinate model to analyze the height of the murderers in the video footage of the crime, the one who calmly left was six feet one inch (about 185 centimeters) tall, and the one who ran away in a panic was only five feet 10 inches (less than 176 centimeters) at most."

Jack sat in the corner, playing the videos on the tablet over and over again, the video files had been processed by Garcia, and the frame drops were noticeable, and the original footage was much smoother and sharper than the previous frame drops.

Jack had no intention of competing with the computer program, and he repeatedly watched the videos of the crime just because he had a vague feeling, but he could not find the moment when the inspiration struck.

The problem is that if it's just a few dozen people, it's just a matter of time, but all five crime scenes are in public, and no matter how indifferent New Yorkers are, when they see a corpse surrounded by a cordon, there are not a few onlookers.

I don't know when Red also stood on tiptoe behind the group, "I know there's a way to verify this, but it may need to wake Garcia up." ”

Garcia is still busy at this time, and she is calling up footage from other time periods through the NYPD's surveillance system, hoping to find some clues from onlookers at the scene after the crime.

But as the old saying goes, as long as the mind doesn't slip, there are more solutions than difficulties, and Rossi told Garcia that it would be fine to find a way to make sure that no one of the same faces had ever been around more than two crime scenes.

"Most of the partner's serial murderers don't commit crimes separately unless there is a reason to do so, such as Muhammad and Malvo in 'DC Sniper', although their first crime was done separately by Malvo, but Muhammad was sitting in a car not far away.

The FBI has a bunch of ready-made programs that can be applied to quickly and accurately identify onlookers one by one through facial recognition, but it requires some human assistance.

"Leave it to me." Jack walked out of the office separately from the crowd and took a deep breath to regain his oxygen before pushing open the pantry door.

"Nope." Everyone shook their heads in unison, including Hodchner, who was holding his arms and grimacing.

Except for the first scene, there was no video of the crime, and Jack played the videos of the remaining four cases one by one in the order in which they occurred.

In the end, Emily said the key, usually a serial killer committing a crime, is a gradual proficient process, from the first time of being unfamiliar and flustered, full of mistakes to gradually cold-blooded, turning murder into something as casual as eating and drinking.

After working overnight to make the facial recognition program run automatically on the computer, Garcia fell asleep on her desk, and in her words, as long as the computer didn't make an alarm sound, it was a sign that there was no gain, so that everyone should not wake her.

"So, there is more than one suspect, what does that mean?" Teacher Rossi's small class can finally start.

"Does anyone see anything strange?" Feeling that the oxygen around him was running out of oxygen by these guys, Jack had to ask questions.

But the third and fourth times, he trotted away from the scene again, giving people a feeling of being a little flustered, but by the fifth time he committed the crime at noon yesterday, he had changed back to his previous appearance of calmly leaving, which didn't make sense. ”

"So there's really not just one suspect." Hodgner still had no expression on his face, and his brow was even deeper.

"What do you mean? The murderer is not the same person? As Jack had judged before, Kate Joyner was not a vase, and immediately understood what everyone meant.

"It's a strange feeling, but I can't say why." Aubremo rubbed his chin and said something nonsense, drawing the eyes of everyone in unison.

"The pattern after the murderer fired was different, we don't know what the situation was the first time, but the second time the murderer was obviously not flustered, but calmly pretended to be a passerby and left quickly.

This is what psychologists and forensic experts have learned from the case of "Sam's Son", the murderer often can't help but return to the scene of the crime after the murder.

The identification of nearly one or two thousand faces at all the crime scenes combined is not something that Garcia alone can do in a short period of time, even if all the analysts and technicians in the operations center are added, it will take a long time.

Jiejie and Hannah exchanged a laughing and tearing look, and within a few minutes, Jack walked back with a blue lip print on his face.

A few minutes later, the microwave in the pantry made a "ding" sound, and then an enticing aroma of passion fruit mixed with rum instantly wafted through the hallway.

There is also Kenneth Bianchi and his cousin Angelo Buno, who was arrested for the large number of clues left by Bianchi during his last two solo crimes, but that was because Buno had previously escaped due to a nervous breakdown. ”

It wasn't long before Garcia's cheers of surprise and an exaggerated pop came from next door.

As Rossi went on to say, "With 5 crimes, it stands to reason that his behavior pattern should have been fixed a long time ago." ”

The eyes of everyone in the conference room followed the large piece of cake in Jack's hand all the way, and they watched as he pushed open the door of the next office.

Soon Emily and newcomer Luke Elvis joined, followed by Danny and Hannah, then Orbrey and Joyna, and finally everyone stood behind Jack except for Red, who was still standing in front of the map and meditating.

This time, Red used another pair of well-known serial murderer partners as an example, Kenneth Bianchi and Angelo Buno are one of the stigmas of LAPD, known as the "Mountainside Strangler".

Between October 1977 and February 1978, 10 young women between the ages of 12 and 28 were killed in Los Angeles and were sexually assaulted before being strangled.

(End of chapter)