Eight state police investigators on the Sandy Hook Elementary School shooting have been paid about $139,000 in overtime since Jan. 1, state records show.

Nearly half has gone to two investigators out of the Southbury barracks, who have both put in for more than 500 hours of overtime since the beginning of the year.

Sgt. Joshua Pattberg has been paid $33,637 in overtime since Jan. 1, state records show. Det. Daniel Jewiss, who works with Pattberg out of the Southbury barracks, has been paid $31,093. Each has surpassed his overtime totals for the last fiscal year when Pattberg was paid about $20,000 and Jewiss about $12,000, according to state records.

The overall number includes the four detectives assigned to the crime squad van, the sergeant who oversees the van and three detectives assigned to the Southbury barracks, the closest barracks to Newtown.

The third detective who works out of the Southbury barracks, Rachael Van Ness, has earned $17,366 in overtime pay, records show.

The four detectives who man the crime squad van have all been paid between $8,900 and $13,000, records show. Sgt. Jeffrey Covello, who oversees four detectives assigned to the van, has been paid about $12,840.

Pattberg and Jewiss have both traveled to conferences in the past few months to talk about the investigation, but state police spokesman Lt. J. Paul Vance said none of the overtime for any officers includes their attendance at conferences.

"There has been absolutely no authorization for overtime for attending any conferences," Vance said. "They only get paid overtime when they are called out to investigate any criminal cases and/or they work past their normal work day. They respond to call outs and must be available 24/7."

Vance added that not all of the overtime is for the Sandy Hook shooting case as the crime squad has been called out to several other crime scenes.

The overtime numbers do not include the last few weeks of 2012, following the Dec. 14 shooting at the Newtown school, which left 20 first graders and six adults dead. The gunman, Adam Lanza, killed himself at the scene.

The Western District Crime Squad spent several weeks inside the two classrooms where the shootings occurred, processing evidence and conducting interviews.

The state police have three crime squads broken down by east, central and west. All three responded to the Sandy Hook shooting. The eastern district was assigned the Lanza household, where the body of Nancy Lanza, the shooter's mother, was found. The central district was assigned the task of identifying the victims as well as processing Adam Lanza's car and parts of the school.

Since Newtown is closest to the Southbury barracks, Pattberg and the detectives there have been assigned the case with Jewiss as the case officer. Vance also explained that Pattberg and Jewiss are paid at a higher rate than some of the other detectives because they are senior officers.

Officials have said the final report on the Sandy Hook shooting may not be ready until at least the fall. State police officials have taken the unusual step of removing the Western District Crime Squad from active calls so they can concentrate on finishing the report.

Sources said for the next few weeks the two other crime squads will cover calls in the western district.