The world of American TV series: Starting with the L.A. Patrol.

A few blurry videos confirmed that the bullets came from the same pistol and the ballistic test results were the few clues that everyone could grasp at the moment. Silence soon fell in the conference room, instead of just saying a word like in the past. I brainstormed in one word.

This feeling is actually very uncomfortable, waiting for the murderer to continue committing crimes, waiting for new bodies to appear, waiting for the murderer to make a mistake or contact the police actively, just like in the "Son of Sam" and "DC Sniper" cases.

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

They use this method to attract public attention, and use it to ridicule and humiliate the police. After succeeding again and again, these serial killers begin to regard this kind of killing as a game with the police, or a cat and mouse. game.

Now everyone in the BAU, including Danny, Joyner and Jack, are all being humiliated. This humiliation not only comes from the murderer's arrogant crime style, but also from the existing victims and the foreseeable ones. Future victim guilt.

Because now they have no means to stop the other party's wanton behavior.

Jack was sitting in the corner, playing those videos on the tablet over and over again. These video files were processed by Garcia. Compared with the previous video with obvious frame drops, it was much smoother than the original video of the cartoon. , the clarity has also increased a lot.

It is a pity that the murderer's face is not shown in these pictures and cannot be used for facial recognition. Garcia is still busy at the moment. She is retrieving videos from other time periods through the NYPD surveillance system, hoping to find out more about the murderer after the incident. Some clues were found among the onlookers at the scene.

That's what psychologists and forensic experts learned from the "Son of Sam" case. After the murder, the murderer often couldn't help but return to the scene of the crime.

But as the old saying goes, as long as the mind is not slipping, there are always more solutions than difficulties. Rossi told Garcia, just find a way to make sure that the same face does not appear around more than two crime scenes.

Jack had no intention of competing with the computer program. He repeatedly viewed the videos of the crime just because he had a vague feeling, but he could never find the moment of inspiration.

"Does anyone see anything strange?" Feeling that the oxygen around him was almost being consumed by these guys, Jack had to ask.

Soon Emily and newcomer Luke Elwes also joined in, then Danny and Hannah, then Aubrey and Joyner, and finally except for Rhett, who was still standing in front of the map and thinking hard, everyone else Everyone stood behind Jack.

After spending the whole night modifying the facial recognition program to run automatically on the computer, Garcia fell asleep on the table. In her words, as long as the computer did not issue an alarm, it meant that there was no gain and she asked everyone not to wake her up.

The problem is that if there are only a few dozen people, it will only take a little time, but all five crime scenes are in public places. No matter how indifferent New Yorkers are, when they see a body surrounded by security tape, no one will stop to watch. Will be in the minority.

The identification of nearly one to two thousand faces at all crime scenes cannot be done by Garcia alone in a short time. Even if all the analysts and technicians in the operations center are included, it will take a long time.

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

"No." Everyone shook their heads, including Hotchner, who had his arms crossed and a straight face.

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

"It does feel strange, but I can't explain why." Aubrey rubbed his chin and said something nonsense, which attracted unanimous eye rolls from everyone.

"The murderer's pattern after shooting was different. We don't know what happened the first time, but the second time the murderer obviously didn't panic, but calmly pretended to be a passerby and left quickly.

But the third and fourth times, he trotted away from the scene again, giving the impression that he was a little flustered. However, when he committed the fifth crime at noon yesterday, he returned to his calm attitude of leaving before. This does not make sense. "

In the end, it was Emily who said the key. Generally speaking, serial killers commit crimes, which is a process of gradual proficiency. From the first time they are unfamiliar and panicked, full of mistakes, they gradually become cold-blooded, turning killing into something as casual as eating and drinking. things.

As Rossi said next, "After committing five crimes, it stands to reason that his behavioral pattern should have been fixed long ago."

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

I don't know when Rhett also stood on tiptoe behind everyone, "I know there is a way to verify this, but it may need to wake up Garcia."

"Leave it to me." Jack separated from the crowd and walked out of the office. He took a deep breath to regain oxygen before opening the tea room door.

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

The eyes of everyone in the conference room followed the large piece of cake in Jack's hand, and watched eagerly as he opened the door of the office next door.

Not long after, Garcia's surprise cheers and an exaggerated bang came from next door.

Jie Jie and Hannah exchanged dumbfounding glances, and within a few minutes, Jack came back with a blue lip mark on his face.

"Well, Garcia used a digital coordinate model to analyze the heights of the murderers in the crime videos. The one who calmly left was six feet one inch (about 185 centimeters) tall, while the one who ran away in panic was only five feet ten inches at most ( less than 10 cm).”

"So there is indeed more than one suspect." Hotchner still had a straight face without any expression, and his frown even deepened.

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

"Most serial killers who partner up will not commit crimes separately unless there is a reason to do so. For example, Mohammed and Malvo in 'DC Sniper', although they committed the crime separately for the first time, Malvo Ervo, but Muhammad was sitting in a car not far away.

There are also Kenneth Bianchi and his cousin Angelo Buono. Bianchi left a lot of clues when he committed crimes alone in the last two times and was arrested, but that was because Buono had been mentally ill before. Crash and run away. "

This time Reid used another pair of famous serial murderers as an example. Kenneth Bianchi and Angelo Buono were one of the disgrace of the LAPD and were known as the "Mountainside Strangler".

Between October 1977 and February 10, 1978 young women were murdered in Los Angeles. They were aged between 2 and 10. They were all sexually assaulted before being strangled to death. Their naked bodies were Abandoned on a hillside near Hollywood, it was covered with the scars of abuse.