(CNN) -- A Florida exterminator whose dead daughter and injured son were found in his truck has been charged with attempted murder, and police were searching his Miami home Thursday night, police said. 

Chase Scott, spokesman for West Palm Beach Police, told CNN that officers were executing a search warrant for evidence in the home of Jorge and Carmen Barahona. 

Jorge Barahona, 53, was found unconscious beside his pest-control truck early Monday along a south Florida interstate by a road assistance ranger, along with his 10-year-old adopted son, who was inside the vehicle next to an open gas can, according to a probable-cause affidavit filed by detectives. Hours later, crews removing toxic chemicals from the truck discovered the boy's twin sister dead in a plastic bag. 

Earlier Thursday, Barahona was taken to a hospital Thursday after he "attempted to harm himself," police said. 

Barahona, who was in custody in the Palm Beach County Jail, suffered a self-inflicted injury after deputies told him to get ready to go to a court hearing Thursday morning, West Palm Beach Police spokesman Scott Chase said. 

"He immediately attempted to harm himself by thrusting himself backwards, causing an injury to his head," Chase said. "He was immediately checked by emergency personnel and it was decided he was OK to appear in court." 

However, Barahona "refused to cooperate" by not speaking and the judge decided to delay the hearing until another date, Chase said. 

Authorities later decided to take Barahona to Wellington Regional Medical Center for observation, he said. 
Why?
Authorities later decided to take Barahona to Wellington Regional Medical Center for observation