Airport authorities reportedly found cocaine in a wallet McGowan left behind at Washington Dulles International Airport while she headed to the Woman's March in January 2017.
News outlets report a Loudoun County grand jury handed down the indictment on Monday.
One of McGowan's attorneys has noted that many people had access to his client's wallet for several hours, saying, "Depending on when and where the wallet was lost, individuals other than Ms. McGowan had access to the wallet for somewhere between approximately 5 hours 40 minutes and more than 11 hours".
McGowan told Farrow that she was afraid when an airport police detective called her to retrieve her wallet, as she was unsure whether he was actually a detective.
She has maintained her innocence; her lawyers have argued that someone planted the cocaine, possibly someone connected to Weinstein. These charges would have never been brought if it weren't for her activism as a voice for women everywhere.
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McGowan has maintained the cocaine is not hers, suggesting in court papers that the drugs were planted at the behest of movie producer Harvey Weinstein. "I assure you, this selective prosecution will be met with a strong defence".
"It is now public knowledge that Weinstein employed underhanded tactics to "silence" his victims", she wrote.
She reacted quickly with a tweet in which she charged that "they" were trying to get her to keep quiet about claims she had made about Weinstein's sexual misconduct with her.
TMZ reported that the actress pleaded not guilty.