Bryan Kohberger, the man accused of killing four University of Idaho students in November, was seen wearing sterile gloves numerous times before being detained by police, according to a law enforcement source.

Kohberger, 28, is the primary suspect in the murders of students Kaylee Goncalves, 21, Madison Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20, who were discovered dead in their off-campus house in Moscow, Idaho, on November 13.

At the time of the murders, Kohberger was working on his PhD in criminal justice at Washington State University. According to a law enforcement source, Kohberger “cleaned his automobile, inside and out, not missing an inch.”

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An unnamed source was briefed on the observations made by detectives over the four days of surveillance that preceded Kohberger’s arrest at his family’s Pennsylvania residence on December 30.

New information has come to light clarifying some of the suspect’s travels in the days preceding his arrest while Kohberger is currently being held in custody in Idaho while awaiting his status hearing on January 12.

According to numerous law enforcement sources, a surveillance team assigned to Kohberger was tasked with two tasks: keep an eye on him so they could arrest him as soon as a warrant was issued; and try to get hold of something that would yield a DNA sample from Kohberger, which could then be compared to DNA evidence discovered at the crime scene.

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The law enforcement source claims that Kohberger was frequently observed wearing surgical gloves outside the Pennsylvania residence.

Before Kohberger’s arrest, officials once saw him leave his home at around 4 a.m. and place trash bags in the neighbors’ trash cans, the source claimed. At that moment, according to the source, authorities recovered trash from the Kohberger family’s trash cans and waste that was seen being disposed of in the trash cans of the neighbors. According to the source, the recovered materials were delivered to the Idaho State Lab.

A Pennsylvania State Police SWAT unit entered the Kohberger family home last Friday using a “dynamic entry,” a technique only occasionally employed to apprehend “high risk” criminals, the source claimed.

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Kohberger was kept in Latah County jail on Wednesday night after being extradited from Pennsylvania, and he made his first court appearance in Idaho on Thursday. Four counts of first-degree murder and one count of burglary have been brought against Kohberger. At the hearing, he chose not to enter a plea.