MISSING Brian Laundrie's parents have 'behaved strangely' since his fiancee Gabby Petitio's death and cops may use GPS to track movements of their cars, a forensics expert has told The Sun.
The FBI have launched a million dollar manhunt for the 23-year-old, after he vanished from his family home in Florida – just days before Gabby was found dead in a forest in Wyoming.
Before disappearing, the young traveler and his parents, Chris, 62, and Roberta, 55, reportedly refused to cooperate with cops, who were desperately searching for Gabby after a road trip with Brian.
His family have been slammed by the public for not helping to search for Gabby, who was reported missing by her family days after Brian returned home to Florida without her.
Jennifer Shen, a former director of the San Diego Police Department's Crime Lab, told The Sun exclusively: "I think Brian’s parents have exhibited very odd behavior. It appears they know where he is, or where he went at least.
"Their home is fair game for searching, as it is a potential crime scene, and the [alleged] suspect lives there.
"It does appear the parents were complicit in his disappearance, although we may never know.
"The cars are also evidence, as they may point to where Brian was last seen by his parents, and therefore give some indication as to where he may have gone.
"The cars may provide GPS tracking, location information, or physical evidence (signs of Brian himself) that would clarify the parents' involvement."
It was revealed earlier this week Brian and his family stayed at a Florida campground 75 miles from their home just days before he vanished, leading some to suspect his parents know where he is.
The potential lead in the case was first offered by Dog the Bounty Hunter, who said he'd received a tip that the trio had visited Fort De Soto Park twice in September, most recently on September 6.
However, Dog claimed that Brian was not with Chris and Roberta Laundrie when they checked out of the park two days later, on September 8.
In a statement to WPBF, the Laundrie family's lawyer Steven Bertolino slammed the allegation, insisting Brian did return home with his parents.
"That dog doesn't know what he's talking about," Bertolino wrote in a text to the outlet.
"The Laundries had reservations at the campground for September 1 to 3. They canceled those reservations and did not go to the park during that weekend although dog says they did.
"They did go to that campground September 6 and 7 as a family and they all left together despite the claims of others."
Bertolino added that Brian and his parents went to "other places on two different dates" which the FBI is allegedly aware of.
"So Brian obviously returned home after camping and what that dog is spewing is nothing but baloney," he wrote.
Brian's older sister has since revealed she went camping with their family after he returned from his van life trip with Gabby Petito alone – despite previously claiming she hadn't seen him.
His family continue to face a backlash for their silence and behavior since Gabby's body was found, as her family believe Brian is hiding.
They have begged him to give himself up if he's still alive, while the FBI have reportedly scaled back their search in recent days.
Asked how they will try and find Brian, expert Jennifer Shen told The Sun: Drone technology, thermal imaging (infrared – tracks images giving off heat such as a person), canine units, and good old fashioned grid searches will likely be how they accomplish a successful search."
She previously said she believes there is a 50/50 chance he could dead after leaving his phone, wallet and other possessions at home and allegedly telling his parents he was going on a hike.
WANTED BY THE FBI
Chris and Roberta Laundrie claim that they last saw their missing son on September 14 when he didn't return from the 24,000-acre Carlton Reserve in Florida.
But the Laundries didn't report him missing until September 17.
Two days later, Gabby's remains are found near a campground in Grand Teton National Park..
Brian, who remains the only person of interest following her death, is wanted by the FBI for using an unauthorized debit card and pin code to access two bank accounts August 30 and September 1.
The Capital One card is believed to belong to Gabby – and he racked up a bill of $1,000, according to police.
"It would seem likely if Brian's body is recovered, he will have killed himself," Shen told The Sun. "Depending on where his body is found, it might be difficult to ascertain how he did that.
"The area the police are looking is difficult terrain, and finding a body, undisturbed by the topography or animal life is unlikely. I think at this point it is equally likely he is dead as alive.
"The more time passes without locating him, the greater the chances he is not alive. It is extremely difficult to 'disappear' in today's world, when everything is so interconnected."
Meanwhile, the FBI are said to be investigating reports of a burner phone bought on the day Laundrie went missing.
Agents are said to be looking into security footage taken at a store near his parent's home in North Port, Florida.
A source told TMZ that Brian purchased a phone at the AT&T store on September 14 with an "older woman."
The store said in a statement to The Sun: "We're not confirming or denying anything and we're not making any statements, thank you and have a great day."
Laundrie family attorney Steven Bertolino said: "To my knowledge, they did purchase a new phone and it's the same phone that Brian left home and which the FBI is in possession of."
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