MISAWA AIR BASE, Japan — Japanese police on Wednesday arrested the wife of a Misawa airman on suspicion of smuggling and possessing less than half a gram of an illegal drug, according to an Aomori prefecture police spokesman.

The spokesman, who provided information on the condition of anonymity, said the woman was Kathryn Anne Ancheta Hairston, 28, a Philippine national.

Hairston allegedly had 0.498 grams of drugs sent to her from an acquaintance in the Philippines on Feb. 27 via international mail, the spokesman said. It entered Japan around March 1, where it was intercepted at Hakodate Customs in Hokkaido, according to a Misawa police spokesman.

Officials would not name the drug, citing the ongoing investigation. They referred to it only as a “stimulant.”

Hairston also is suspected of using drugs at her house on Misawa Air Base around March 11 and possessing 0.086 grams “of stimulants” on March 12, the Aomori prefecture police spokesman said.

Japanese police, with assistance from the U.S. military, discovered the drugs while searching Hairston’s base residence, according to the spokesman.

After reporting to the Misawa police station for voluntary questioning, Hairston was arrested at 1 p.m. Wednesday, the Misawa police spokesman said. She remained in police custody as of Thursday, he said.

Base officials confirmed Thursday that Hairston was a dependent living at Misawa, married to an active-duty airman. His rank and squadron were not disclosed. Base spokesman Staff Sgt. Vann Miller said the airman is not under investigation.