Benton County and federal agents searched a home along East 25th Avenue in Finley on Wednesday in connection with a recent spike in fentanyl overdoses in the region.
The details of the investigation remain unclear, but deputies and Drug Enforcement Agency investigators joined members the Tri-City Metro Drug Task Force at the mobile home starting about 7 a.m.
One person was taken out of the home in handcuffs.
Tracy Simmons with the Drug Enforcement Agency said it is related to an increase in fentanyl in the area but wasn't able to talk about the Finley connection.
"The reason we're out here today and doing the things that we're doing is that we're seeing an increase in fentanyl-laced products here in the Tri-Cities area and throughout Eastern Washington," he said.
The powerful opiate is used to supplement other drugs such as heroin and oxycodone.
In Kennewick alone, opioids are blamed for 14 deaths and 46 overdoses since January 2017.
Fentanyl can be 30 to 50 times more potent than heroin, and people manufacturing the drug may not understand the strength, increasing the potential for overdoses, said officials.
"Folks get a hold of these and they do not understand how powerful they are," Simmons said. "It's not regulated, so you can get a pill that has zero fentanyl in it and the next pill you take can have massive overdose quantities of it."