AP Photo/Reed Saxon, File

FILE - In this Oct. 15, 2016 file photo, Los Angeles police investigators work the scene of a fatal shooting in the Crenshaw District of Los Angeles.  Cold cases are getting colder, plainclothes investigators are digging out their dusty uniforms for patrol duty, and detectives are struggling to find new ways to connect with victims through thick masks. 

LOS ANGELES (AP) — Cold cases are getting colder. Detectives are struggling to connect with victims through thick masks, and investigators accustomed to wearing plainclothes are digging out their dusty uniforms for patrol duty as the coronavirus pandemic rages.

Police departments nationwide are grappling with changes the virus has wrought on their investigations, even as law enforcement agencies report major decreases in crime due to stay-at-home orders. Authorities say enough wrongdoing abounds to keep police busy, and detective work must still be in-person and hands-on, despite COVID-19. Evidence has to be collected, statements must be taken in person and death notifications need to be made face-to-face.

“You put on gloves and you put on masks and you’ve still got to go out there and do it,” said Los Angeles Police Capt. Jonathan Tippet, head of the elite Robbery-Homicide Division.

Police around the country have to put some investigations on hold as they detail detectives to help out with social distance patrols, or cover for their colleagues out sick with COVID-19.

It’s worrisome to former New York Police Department Sgt. Joe Giacalone, who is concerned about criminals across the country who will go undetected in the meantime.

“That becomes a bigger problem down the road,” Giacalone, a former cold case detective now a professor at the John Jay College of Criminal Justice. “Investigators prevent further victimization by getting these guys off the streets.”

Despite fewer detectives in bureaus, police are finding workarounds and high-profile cases are still getting the necessary attention. The Los Angeles district attorney filed an additional sexual assault charge against disgraced film mogul Harvey Weinstein in April, and investigators in New York continue to delve into an unsolved Long Island serial killer case after they revealed new evidence earlier this year.

In some cases, like cyber or financial crime, interviews can be transitioned to the phone to preserve social distancing. But others, such as sexual abuse, in-person interviews are a necessity.

For traumatized children who need to be comforted, Los Angeles County sheriff’s detectives give “air hugs” and teach the kids phrases like “I love you” in sign language to overcome the impersonal nature of masks and social distancing.

“They’ll do anything they can to make these kids and these victims feel safe,” said Carlos Marquez, a detective division commander in the Los Angeles County Sheriff’s Department.

Detectives elsewhere have been forced to investigate crimes that are outside their normal specialties. In the hardest-hit part of New Jersey, investigators in the Bergen County Prosecutor’s Office have been moved out of their individual squads — such as narcotics or sex crimes — into “one big detective bureau.”

That bureau is now made up of three mixed 35-person platoons, which work from home part of the time. The goal is to avoid an entire specialty squad contracting — or spreading — the virus and leaving the office without an important skill set.

“We can’t have the homicide squad coming in and out of the building left and right, infecting people,” Chief of Detectives Robert Anzilotti said.