Two people charged in the biggest crackdown on marijuana dispensaries in Washington state have pleaded guilty to federal charges.

Seattle residents Craig Dieffenbach and Jingjing Mo entered the pleas in U.S. District Court in Seattle on Monday. Each admitted conspiring to distribute marijuana and conspiring to launder money. They face potential five-year mandatory minimum sentences, but could receive significantly less time if they cooperate with investigators.

The pair ran two dispensaries under the name Seattle Cannabis Cooperative, which were among 13 dispensaries raided by state and federal authorities last November. Authorities said the shops purported to be serving medical marijuana patients, but were fronts for illicit drug sales.

At one point, Mo sold a pound of marijuana to a DEA informant, with Dieffenbach's knowledge.

A defendant in another dispensary raid was expected to plead guilty Monday afternoon.