Toyota’s chief communications officer has resigned following her arrest two weeks ago in Japan for allegedly violating the Narcotics Control Act by bringing more than four dozen tablets of the painkiller oxycodone into the country, according to the BBC.

Julie Hamp, 55, who CNN Money reports is the first woman to be named a senior executive at the Japanese automaker, was arrested on June 18 after Japanese customs officials discovered 57 oxycodone tablets in a package labeled "necklaces" and addressed to herself, according to the website. The package had been mailed from the U.S.

While oxycodone is a legal substance in both countries, in order to bring the potent and addictive painkiller into Japan a person must have a prescription for it as well as have prior approval from the government. The drug must be carried by the individual, according to Yahoo News.

Japanese police say Hamp told them she did not think she had imported an illegal substance.

She has not been charged but remains in police custody. According to Yahoo News, Japanese law permits a suspect to remain in detention for up to 20 days after being arrested. July 8 will mark 20 days.

During a news conference, the automaker’s president, Akio Toyoda, said Hamp did not intend to break the law. Toyoda "called (Hamp) an 'indispensable' colleague that the company believed in," CNN Money reports.

The company should have better prepared Hamp for her relocation to Japan, he added.

"Through the investigation, I believe that we will learn she had no intent to violate the law," he said.

The company issued a statement accepting Hamp's resignation after "considering the concerns and inconvenience that recent events have caused our stakeholders."

Hamp, a U.S. citizen, leaves Toyota about a month after she relocated there following her April appointment as the automaker's chief communications officer. Her ascension "was part of a drive by the company to diversify a male-dominated, mostly Japanese executive lineup," according to Yahoo.

She previously served as senior vice president and chief communications officer for PepsiCo and before that as vice president of communications for General Motors Europe, according to her LinkedIn page.

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