The bodies were found around 8:30 a.m. Sunday by a deputy who was doing a routine address check on sexual offenders.
Detective Sergeant Jerry Bates said a deputy noticed that the door to the home was open, and found the bodies near what looked like a booby trap, or device, made of hazardous materials.
A bomb squad and hazmat team arrived at the home in the 7700 Block of 200th Street East shortly after 10 a.m. to inspect the suspicious device and make sure the home was safe for detectives to enter.
"It looks like they tried to build an electric fence or electric perimeter to possibly protect a marijuana grow operation, but it doesn't appear like it was very active," Bates said. "So it might have been old."
Homicide detectives were able to enter the home Sunday afternoon, and are investigating the scene.
A vehicle associated with the home was later found by Tacoma police officers near South 96th Street and Pacific Avenue South. Four people have been detained for questioning, Bates said.
Frederickson is about 20 miles south of Tacoma.