Deputy District Attorney Robert Sherwood said the women sold 15,000 ounces of crystalized iodine, enough to make 930 pounds of methamphetamine, which is a powerful stimulant brewed in secret makeshift laboratories, many in the Antelope Valley.
Crystalized iodine is also used as a medicine for horses' hoofs.
All four have pleaded not guilty to misdemeanor charges that they failed to comply with a 1999 state law requiring sellers of crystalized
iodine - a medication for sore hooves as well as a methamphetamine ingredient - to obtain identification and license plate numbers from customers.
Authorities said the Granicy's store was one of the few selling crystalized
iodine, and that state records showed it sold a sizable amount - more than 900 pounds in about 14 months.
Undercover officers say they bought more than 21 ounces of crystalized
iodine in February in five separate purchases without providing the necessary identification.
A 1999 state law requires sellers of crystalized
iodine, commonly used to treat animal diseases, to get the buyer's name, address, vehicle description and license plate number as well as a driver's license or state identification card number.
The attorneys say sisters Armitta Granicy, 59, Ramona Beck, 61, and Dorothy Manning, 67, should have never been arrested under a year-old state law that requires stores to obtain identification from customers purchasing crystalized iodine - a component in manufacturing methamphetamine.
The Granicys own Granicy's Feed Store, where undercover officers say they bought more than 21 ounces of crystalized iodine in February in five separate purchases without providing the necessary identification.
In the past six months, Granicy's Valley Wide Feed store purchased from wholesalers 7,600 ounces of crystalized
iodine - enough, deputies said, for 91,200 typical doses for a horse with hoof disease.