"What?" Danny turned the steering wheel and pulled over to the side of the road, where a van painted with a purple and yellow logo was parked on the side of the street, and a young white woman in a FedEx uniform with a single ponytail was loading and unloading the parcel next to the car.

"I'll talk about it later, grab this Vázquez first." Jack Kla got out of the car and pulled out his pistol.

Both were wearing body armor, one with the NYPD printed and the other printed with the FBI, which caused a commotion among the people around them as soon as they got out of the car.

The young woman, who was bending down to pack up the parcel, realized that something was wrong and looked back, and under the same eyes, she jumped up like an agile antelope and got straight into the traffic.

"Oh, come on, I hate chases." Danny turned around to find that Jack was already across the road, sighed in resignation, put away his pistol and followed.

When he finally got across the road through the crowded traffic, he could no longer see the backs of the two men, but fortunately, the shouts of passers-by pointed him in the direction and successfully tracked him all the way to the back kitchen of a fast-food restaurant not far away.

"Shoot! Kill me! At this time, Marcia Vázquez was confronting Jack with a cleaver, looking like a madman, "Shoot! Or I'll kill you! ”

In stark contrast, Jack's voice across from her was a little too calm, "Put down the knife, you're in enough trouble, there's no need to add a felony for assaulting the police." ”

Danny crept behind the woman, and was about to do something when he was surprised to see Jack put away his gun.

"What are you going to do?" Danny didn't make a sound, silently asking Jack with a grin of teeth, not understanding what he wanted to do.

"Come on, you have two choices, take out me and run away from the front, or turn around and face my partner's gun." Jack beckoned a defiant gesture towards the fierce woman.

"Fakyu!" The woman brandished a cleaver and rushed at Jack.

The sharp blade cut through the air, and the next second it stopped in mid-air, and the woman's wrist was firmly held by Jack, and with a slight shake, it hung down weakly, and the knife fell to the ground with a thud.

"Be careful!" Danny gave up a warning because the woman did not give up her resistance, and her strong right leg was raised violently, and her knee was pushed against Jack's vital point.

"Bang!" A dull crash sounded, Jack's left leg came first, and the two knees collided solidly, Jack's face remained unchanged, and the woman's face twitched in pain.

"Whew!" Jack's right hand on the woman's armpit turned abruptly, and a large windmill fell over the shoulder, as if it were just throwing a pillow away.

"You've been arrested, Marcia Vázquez"

Danny stepped forward to restrain her, pulled the stunned woman from the ground, and whispered to Jack, "That's what you said you must not spare when facing a serial killer?" ”

"Trust me, Danny, she's not a serial killer." Jack also whispered, but didn't explain much.

——

"What do you mean she's not the serial killer we're looking for?" In the CSI lab, in Mike Taylor's office, several people looked at each other.

Jack's face did not have the joy of discovering the truth, on the contrary, he was even a little irritated, "Do you remember the 'Ghost of Heilbronn' that happened in Germany and France back then?" I think CSI Labs is in big trouble this time. ”

"The Ghost of Heilbronn" is a famous unsolved case of the last century, in the 90s, a mysterious serial killer appeared in Germany, and the crime lasted for 16 years, during which time a total of more than 40 murders were committed.

DNA technology was first used in criminal cases in the United Kingdom in 1985, and then soon developed into European countries, becoming a powerful tool for solving crimes, and related technologies in various application fields are also emerging one after another.

In 1993, a 62-year-old lady was strangled to death with a wire in a small town in southwestern Germany, and the police used the latest forensic technology, that is, DNA fingerprint technology, to extract the DNA of a strange woman from a teacup at the scene.

However, at that time, the fingerprint information database had not yet been established, and the police had never been able to find the corresponding suspect, so the murderer could only be judged to be a woman through DNA, so the case has been dragging on without progress.

Until 2001, there was another murder of an antique dealer in Freiburg, Germany, the cause of death was the same strangulation, and the same DNA appeared at the scene.

Seven months later, the same DNA was collected from a needle used to inject drugs at the scene of another homicide, and in 2007, two German anti-narcotics police officers were attacked, one killed and one wounded, and mysterious DNA reappeared on the bullet casings at the scene.

In order to hunt down this mysterious female killer, the German police spent $18 million to investigate more than 800 female suspects, but they seemed to be a ghost, and their whereabouts became more and more erratic.

Even with the deepening of the investigation, more cases were revealed, and the whereabouts of the mysterious female killer spread all over European countries, France, Austria and other countries have appeared in her figure, and the total number of cases is as high as more than 40 cases, which has caused a sensation throughout Europe.

It wasn't until 2009 that the mysterious female killer was finally caught, because "she" didn't exist at all, and after further joint investigation by the French and German police, it was discovered that the cotton swabs used by the police in these European countries to extract DNA from crime scenes had been contaminated over the past 16 years.

At that time, the cotton swabs used by the police in Germany, France and Austria all came from the same supplier, a cotton swab factory in Austria, and due to the irregular disinfection process of the factory, the cotton swab heads were stained with the DNA of the same female employee.

At that time, everyone didn't know how the German police felt after discovering the truth, but after listening to Jack's speculation, everyone in the CSI laboratory was extremely devastated.

Jack's remark that CSI labs are in big trouble is not for nothing, because the contamination of DNA evidence is likely to mean that a series of recent convictions based on DNA evidence may be implicated, and what this means is self-explanatory.

Some of the most serious cases that have been convicted with great difficulty may be reversed, and the prosecution will need to find new evidence, and if all else does not go so well, some of the most heinous criminals may be acquitted.

Everyone, including Danny, realized the seriousness of the problem, "Farke, I'm going to contact my sister Erin as soon as possible, and she was still complaining to me at last week's house gathering about how the serial rapist and murderer named Dick Reed scared the only witness out of court. ”

"Remember to contact your father, Commissioner Reagan, by the way, the NYPD also needs to develop a response as soon as possible." As he spoke, Jack grabbed a box of cotton swabs on the table and turned around with Mike Taylor to get ready to go out.

"Where are you going?" Stella Bonasila asked hurriedly.

"Brooklyn, go test Jack's guess." Mike Taylor replied in a deep voice.

(End of chapter)