DOVER, Del. — A federal judge has scheduled a hearing next month on a defense motion to dismiss an indictment against a former Delaware prison guard charged with accepting bribes to smuggle contraband to inmates.

Lorraine Mosley is accused of taking a $100 bribe to smuggle a cellphone to an inmate at the women’s prison in New Castle. She is charged with conspiracy and “extortion under color of official right.”

Mosley’s public defenders argue that the allegations against her do not qualify as an “official act” because the alleged receipt of a cellphone in exchange for money is not a formal exercise of governmental power under federal law.

Two other former prison guards face sentencing next month after pleading guilty in a similar smuggling case at the Vaughn maximum-security prison in Smyrna.