McFarland entered guilty pleas to about 30 charges including offering/manufacturing methamphetamine, offering/supplying GBL, also known as fantasy or liquid ecstasy, possessing a precursor, producing ephedrine, and one charge of unlawful possession of a firearm.
Murray, a farmer, pleaded guilty to two charges of producing methamphetamine and also unlawful possession of a firearm, a .303 calibre action rifle, unlawful possession of a prohibited firearm, a Ruger mini-30 rifle, possession of precursor substances, and class B drug ephedrine.
Whiting entered guilty pleas to more than 10 charges relating to the supply and manufacturing of methamphetamine.
Another alleged offender is due in court on March 24.
McFarland, Murray and Whiting will be sentenced on May 3.