The search for Gabby Petito’s fiancé Brian Laundrie continues. Here’s why it’s been so hard to find him

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By Amir Vera, CNN

Police in Florida resumed their search this week for Brian Laundrie, the fiancé of Gabby Petito, whose remains were found Sunday.

Investigators are searching for Laundrie on the Venice side of the Carlton Reserve, a 25,000-acre nature reserve near the family’s home in North Port.

About 75 personnel from 16 agencies were on the ground Thursday, said North Port police spokesman Josh Taylor. He said the FBI is leading the investigation and local police are “assisting our federal partner in any way we can to bring this investigation to a close.”

An underwater dive team arrived at the Carlton Reserve on Wednesday. The team is from the Sarasota Sheriff’s Office and is called the Sheriff’s Underwater Recovery Force, a team of “highly trained underwater specialists,” who are “called upon to search for evidence of crimes and victims of drowning, water accidents and foul play,” the sheriff’s office website says.

The ongoing search comes as investigators try to piece together what happened to Petito, 22, and Laundrie, 23, on their road trip through the West this summer. The couple had posted online regularly about their travels with the hashtag #VanLife, but those posts abruptly stopped in late August.

Laundrie returned to his parents’ home in Florida without her on September 1, according to police. Petito was reported missing by her parents on September 11. A coroner confirmed Tuesday the remains found Sunday in Wyoming’s Bridger-Teton National Forest are those of Petito.

Meanwhile, Laundrie’s family told police on Friday night they had not seen him since September 14. His family told police he left home with his backpack and told them he was going to the nearby Carlton Reserve.

A source close to Laundrie’s family told CNN’s Chris Cuomo that Laundrie left their home without his cell phone and wallet.

Laundrie had refused to speak with police about Petito’s whereabouts prior to going missing, authorities said.

The case has become an obsession for many, spurring digital detectives to comb through the couple’s online trail and try to solve the case. At the same time, that intense interest has highlighted how race and gender impact which of the nearly 90,000 unsolved missing persons cases get attention, and which ones don’t.

CNN spoke with several experts in policing and search and rescue efforts to understand the challenges in attempting to locate Laundrie. Here’s what they said.

Laundrie had a multiple-day head start

Police in North Port have focused the search on the wilderness of the Carlton Reserve, relying on drones for video and bloodhounds who used Laundrie’s clothing to get his scent, Taylor said.

Police said Monday they shifted the focus of their search and are no longer looking for Laundrie in the nature reserve. “At this time, we currently believe we have exhausted all avenues in searching of the grounds there,” Taylor said.

However, police said Tuesday morning they were again searching for him at the reserve. Authorities have been on site since 8 a.m. Tuesday, the state Fish and Wildlife Conservation Commission said.

The search “has yet to yield any answers, but we must press on,” police said in a Facebook post on Tuesday.

“Please be aware, the Carlton Reserve is a vast and unforgiving location at times. It is currently (waist) deep in water in many areas,” police said. “This is dangerous work for the search crews as they are wading through gator and snake infested swamps and flooded hiking and biking trails.”

Before he disappeared, Laundrie was home in North Port for about two weeks.

Cheryl Dorsey, a retired Los Angeles police sergeant, told CNN on Monday she was curious why Laundrie’s parents did not alert authorities about his leaving.

“I get that he’s a grown man,” Dorsey said, adding that he’s still just in his early 20s. “What influence, if any, do (his parents) have over him? He decides to go backpacking and they couldn’t stop him?”

Wilderness searches are difficult

In a nature reserve, foliage and the lack of sunlight affects visibility, according to Chris Boyer, executive director of the nonprofit National Association for Search and Rescue (NASAR). The night can also hamper efforts, especially if the person being sought has no source of light or fire.

But when it comes to people eluding authorities, the search becomes much more difficult. An evasive person is more than likely wearing clothing that helps them blend in with their surroundings, Boyer said. In order to avoid being seen by helicopters or drones, an individual may also crawl in creek beds and avoid leaving tracks — such as footprints, trash or evidence of a fire.

Boyer said technology like night vision goggles, drones and thermal sensors could help in pinning down a person’s location.

Boyer said trying to find a person in the wilderness can be very difficult.

“It’s really hard to find people, even when they want to be found,” he told CNN on Monday.

What makes finding Laundrie difficult, though, is the distance he could have already traveled before authorities started looking for him.

“The search area starts to grow every hour he could be in a car or be on foot,” Boyer said. “It gets pretty daunting, to be honest.”

Boyer told CNN on Thursday that conditions in Carlton Reserve are very fierce. About 75% of the reserve is covered in water that is not drinkable, and there are alligators, snakes and bugs. Laundrie also has to worry about heat, humidity and sun exposure, Boyer said.

“If he is there, he found a dry spot, and set up some sort of shelter,” Boyer said via text message, adding that in order for Laundrie to stay hydrated he’d need a filter. “He could not carry enough water with him to last 7 days.”

Federal arrest warrant issued for Laundrie

A US District of Wyoming grand jury indicted Laundrie on charges of using two financial accounts that did not belong to him between August 30 and September 1.

The indictment says he used these accounts to charge more than $1,000 of commerce following the death of Petito that affected interstate commerce. Laundrie did this “knowingly and with intent to defraud,” according to the indictment released Thursday.

An attorney for Laundrie’s family emphasized in a statement that an arrest warrant was not for Petito’s death but related to activities that took place afterward.

The FBI executed a search warrant Monday on Laundrie’s parents’ home, where he lived with Petito.

The FBI removed Christopher and Roberta Laundrie from the home, executed the search warrant, and then brought them back inside for questioning, Taylor said.

Police visited the home last week but the family refused to talk and instead gave authorities their attorney’s information, Taylor said.

“We think he is likely one of the last people to see Gabby Petito alive, and for that reason he’s a very important witness,” said Andrew McCabe, CNN senior law enforcement analyst and former deputy director of the FBI.

Before he vanished, Laundrie was silent about Petito’s disappearance. North Port Police Chief Todd Garrison told CNN’s Don Lemon last week that Laundrie had invoked his Fifth Amendment right, which generally means a person cannot be forced to make statements they feel might be negative or used against them.

Steve Moore, retired FBI supervisory special agent, told CNN that in order to obtain a search warrant, authorities would need to have probable cause there had been a crime and the person at the home was involved in the crime.

“What I believe people in law enforcement are doing right now are making sure they have all the t’s crossed and i’s dotted because I think they believe — and I believe — they know who did this and they want to make sure their case is perfect at this point,” Moore said.

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CNN’s Andy Rose, Dakin Andone, Travis Caldwell, Eric Levenson, Jenn Selva and Alta Spells contributed to this report.